{"id":281397,"date":"2025-07-10T17:16:22","date_gmt":"2025-07-10T11:46:22","guid":{"rendered":"https:\/\/www.cheggindia.com\/?post_type=general-knowledge&p=281397"},"modified":"2025-09-16T16:45:21","modified_gmt":"2025-09-16T11:15:21","slug":"raman-effect","status":"publish","type":"general-knowledge","link":"https:\/\/www.cheggindia.com\/hi\/general-knowledge\/raman-effect\/","title":{"rendered":"Understanding the Raman Effect: Principles, Theory, and Applications"},"content":{"rendered":"\n

Light has always fascinated scientists because of the way it interacts with matter. One of the most remarkable discoveries in this field is the Raman Effect, which revolutionized modern spectroscopy and earned global recognition for Indian science. The phenomenon was first observed by the renowned Indian physicist Sir Chandrasekhara Venkata Raman in 1928, while experimenting with the scattering of sunlight using simple laboratory instruments. For this groundbreaking discovery, he was awarded the Nobel Prize in Physics in 1930, making him the first Asian scientist to receive this honor in the field of science.<\/p>\n\n\n\n

The Raman Effect refers to the change in wavelength of light when molecules scatter it. Unlike ordinary scattering (Rayleigh scattering), where the wavelength remains unchanged, Raman scattering involves a shift in energy due to interactions with molecules’ vibrational and rotational modes. This effect laid the foundation for a powerful analytical technique known as Raman Spectroscopy, which is widely used in physics, chemistry, medicine, and materials science.<\/p>\n\n\n\n

Today, the Raman Effect is an essential topic for students and researchers. It is also significant for UPSC and competitive exams, where questions are often framed around its principles, applications, and historical background.<\/p>\n\n\n\n

\"raman<\/figure>\n\n\n\n

Historical Background <\/h2>\n\n\n\n

The story of the Raman Effect<\/strong> is closely tied to the legacy of Sir C.V. Raman<\/a><\/strong>, one of India\u2019s most outstanding physicists. In the early 20th century, Raman was deeply fascinated by the color of the sea and sky<\/strong>, and he believed that existing explanations based solely on Rayleigh scattering were incomplete. While returning from a trip to Europe in 1921, he conducted simple experiments on board a ship using prisms and filters to study the scattering of sunlight in water. These experiments sowed the seeds for what later became his most celebrated discovery.<\/p>\n\n\n\n

On 28 February 1928<\/strong>, Raman and his student K.S. Krishnan observed a new phenomenon while passing monochromatic light through transparent liquids. They noticed that the scattered light contained additional frequencies besides the incident light. This confirmed the existence of a new type of scattering, later called the Raman Effect.<\/p>\n\n\n\n

The discovery was revolutionary because it provided direct evidence of the quantum nature of light\u2013matter interaction. Just two years later, in 1930, C.V. Raman was awarded the Nobel Prize in Physics, making him the first Asian scientist to receive this prestigious recognition in the field of science.<\/p>\n\n\n\n

The discovery not only brought global acclaim to Indian science but also inspired generations of researchers. In India, 28 February<\/strong> is celebrated yearly as\u00a0National Science Day<\/strong>\u00a0to commemorate this pathbreaking achievement and\u00a0<\/span>promote scientific curiosity among students.<\/p>\n\n\n\n

Principle of Raman Effect <\/h2>\n\n\n\n

The principle of the Raman Effect lies in the interaction of light with the molecules of a substance. When a beam of monochromatic light (such as laser light) passes through a medium, most of it is scattered without any change in wavelength. This is known as Rayleigh scattering<\/a>. However, a small fraction of the scattered light experiences a change in wavelength due to energy exchange between the photons and the molecules of the medium. This phenomenon is called the Raman Effect.<\/p>\n\n\n\n

In simple terms, when light interacts with molecules, part of its energy can be absorbed or given away to the molecular vibrational or rotational energy levels. As a result, the scattered light may appear with a frequency slightly lower (Stokes line)<\/strong> or higher (Anti-Stokes line)<\/strong> than the incident light.<\/p>\n\n\n\n

\"principle<\/figure>\n\n\n\n
    \n
  • Rayleigh Scattering:<\/strong> No change in wavelength.<\/li>\n\n\n\n
  • Stokes Scattering:<\/strong> Scattered light has a lower frequency (photon loses energy).<\/li>\n\n\n\n
  • Anti-Stokes Scattering:<\/strong> Scattered light has a higher frequency (photon gains energy).<\/li>\n<\/ul>\n\n\n\n

    The Raman Effect is significant because it provides a unique \u201cfingerprint\u201d of molecules. Each substance interacts differently with light, producing distinct Raman shifts that can be analyzed. This principle is the foundation of Raman Spectroscopy, a non-destructive analytical technique used in fields ranging from chemistry and physics to medicine and forensics.<\/p>\n\n\n\n

    Thus, the principle of the Raman Effect demonstrates how light scattering reveals molecules’\u00a0internal vibrational and rotational structure<\/span>, making it one of the most powerful tools in modern science.<\/p>\n\n\n\n

    Theory of Raman Effect (Quantum Explanation)<\/h2>\n\n\n\n

    The theory of the Raman Effect can be understood using quantum mechanics concepts. When a photon of light interacts with a molecule, it can either scatter elastically (without energy change) or inelastically (with energy change). The inelastic scattering of photons\u00a0<\/span>produces the Raman Effect.<\/p>\n\n\n\n

    According to quantum theory, molecules have discrete rotational and vibrational energy levels. When light interacts with these molecules:<\/p>\n\n\n\n

      \n
    1. Elastic Scattering (Rayleigh):<\/strong>\n
        \n
      • The incident photon excites the molecule but is re-emitted with the same energy.<\/li>\n\n\n\n
      • No change in wavelength is observed.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • Inelastic Scattering (Raman):<\/strong>\n
          \n
        • The photon exchanges energy with the molecule.<\/li>\n\n\n\n
        • This leads to a change in the frequency of the scattered photon.<\/li>\n\n\n\n
        • Stokes Scattering:<\/strong> The photon loses energy to the molecule, resulting in a scattered photon of lower frequency<\/strong>.<\/li>\n\n\n\n
        • Anti-Stokes Scattering:<\/strong> The photon gains energy from the molecule, producing a scattered photon of higher frequency<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

          Mathematically(Raman Effect formula), the Raman shift (\u0394\u03bd) can be expressed as:<\/p>\n\n\n\n

          \u0394\u03bd=\u03bd0\u2212\u03bds\u0394\u03bd = \u03bd_0 – \u03bd_s\u0394\u03bd=\u03bd0\u200b\u2212\u03bds\u200b<\/p>\n\n\n\n

          Where:<\/p>\n\n\n\n

            \n
          • \u03bd0\u03bd_0\u03bd0\u200b = frequency of incident light<\/li>\n\n\n\n
          • \u03bds\u03bd_s\u03bds\u200b = frequency of scattered light<\/li>\n<\/ul>\n\n\n\n

            The intensity<\/strong> of Raman scattering is much weaker than Rayleigh scattering (only about 1 in 10 million photons undergo Raman scattering), which explains why highly sensitive instruments like lasers and detectors are required to observe it.<\/p>\n\n\n\n

            \"raman<\/figure>\n\n\n\n

            The Raman Effect thus provides a direct method to probe molecules’\u00a0vibrational and rotational transitions<\/span>. Since every molecule has unique energy levels, the Raman spectrum serves as a molecular fingerprint, making the theory not just a concept in physics but a practical tool across scientific disciplines.<\/p>\n\n\n\n

            Raman Spectroscopy<\/h2>\n\n\n\n

            The most important application of the Raman Effect is in the development of Raman Spectroscopy, a powerful technique used to study the vibrational, rotational, and other low-frequency modes of molecules. This method measures the wavelength shifts that occur when light is scattered inelastically by a substance.<\/p>\n\n\n\n

            In\u00a0Raman Spectroscopy, a monochromatic light source, usually a\u00a0laser<\/span>,\u00a0is directed at a sample. As the light interacts with the molecules, most photons are scattered elastically (Rayleigh scattering), but a small fraction undergoes inelastic scattering, producing Raman shifts. These shifts are recorded as a Raman spectrum containing unique peaks corresponding to the sample’s molecular structure.<\/p>\n\n\n\n

            Basic Components of a Raman Spectrometer<\/h3>\n\n\n\n
              \n
            1. Laser Source<\/strong> \u2013 provides a monochromatic beam of light.<\/li>\n\n\n\n
            2. Sample Holder<\/strong> \u2013 holds the material under study.<\/li>\n\n\n\n
            3. Scattering Collection Optics<\/strong> \u2013 gathers the scattered light.<\/li>\n\n\n\n
            4. Monochromator\/Filter<\/strong> \u2013 separates Raman scattered light from the strong Rayleigh component.<\/li>\n\n\n\n
            5. Detector (CCD\/PMT)<\/strong> \u2013 measures the intensity of scattered light at different frequencies.<\/li>\n<\/ol>\n\n\n\n

              Advantages of Raman Spectroscopy<\/h3>\n\n\n\n
                \n
              • Non-destructive<\/strong>: Sample does not need to be altered.<\/li>\n\n\n\n
              • Minimal preparation<\/strong>: Works on solids, liquids, and gases.<\/li>\n\n\n\n
              • Complementary to IR Spectroscopy<\/strong>: Detects vibrations that IR may miss.<\/li>\n\n\n\n
              • High specificity<\/strong>: Each molecule produces a unique Raman spectrum as a molecular fingerprint.<\/li>\n<\/ul>\n\n\n\n

                Because of these features, Raman Spectroscopy is widely applied in chemistry, biology, medicine, nanotechnology, and forensic science. From identifying molecular structures to diagnosing diseases, it has become one of the most versatile tools of modern science.<\/p>\n\n\n\n

                Types \/ Variants of Raman Effect <\/h2>\n\n\n\n

                Over time, researchers have developed several variants of the Raman Effect to overcome its limitations and expand its applications. Each type offers unique advantages and is suited for specific scientific or industrial purposes.<\/p>\n\n\n\n

                1. Spontaneous Raman Scattering<\/h3>\n\n\n\n
                  \n
                • The original phenomenon was discovered by C.V. Raman in 1928.<\/li>\n\n\n\n
                • Occurs naturally when light interacts with molecules, producing Stokes and Anti-Stokes lines.<\/li>\n\n\n\n
                • The signal is weak but forms the foundation of Raman spectroscopy.<\/li>\n<\/ul>\n\n\n\n

                  2. Resonance Raman Spectroscopy (RRS)<\/h3>\n\n\n\n
                    \n
                  • Occurs when the incident light frequency is close to an electronic transition of the molecule.<\/li>\n\n\n\n
                  • Greatly enhances Raman scattering intensity (up to 10\u2076 times).<\/li>\n\n\n\n
                  • Useful in studying biological molecules like pigments, hemoglobin, and chlorophyll.<\/li>\n<\/ul>\n\n\n\n

                    3. Surface-Enhanced Raman Scattering (SERS)<\/h3>\n\n\n\n
                      \n
                    • Discovered in the 1970s.<\/li>\n\n\n\n
                    • Raman signal is enhanced when molecules are adsorbed on rough metal surfaces (like silver or gold nanoparticles).<\/li>\n\n\n\n
                    • Used in trace detection of drugs, explosives, pollutants, and biomolecules.<\/li>\n<\/ul>\n\n\n\n

                      4. Coherent Anti-Stokes Raman Scattering (CARS)<\/h3>\n\n\n\n
                        \n
                      • A nonlinear optical process involving multiple laser beams.<\/li>\n\n\n\n
                      • Produces a strong anti-Stokes signal with high resolution.<\/li>\n\n\n\n
                      • Widely used in biomedical imaging for studying live cells without dyes.<\/li>\n<\/ul>\n\n\n\n

                        5. Tip-Enhanced Raman Spectroscopy (TERS)<\/h3>\n\n\n\n
                          \n
                        • Combines Raman spectroscopy with scanning probe microscopy.<\/li>\n\n\n\n
                        • Uses a sharp metallic tip to enhance local Raman signals.<\/li>\n\n\n\n
                        • Provides nanoscale chemical imaging.<\/li>\n<\/ul>\n\n\n\n
                          Variant<\/strong><\/th>Key Feature<\/strong><\/th>Applications<\/strong><\/th><\/tr><\/thead>
                          Spontaneous Raman<\/td>Natural scattering<\/td>General spectroscopy<\/td><\/tr>
                          Resonance Raman<\/td>Enhanced by resonance<\/td>Biological pigments<\/td><\/tr>
                          SERS<\/td>Enhanced on metal surfaces<\/td>Trace detection, forensics<\/td><\/tr>
                          CARS<\/td>Nonlinear process, strong Anti-Stokes<\/td>Live-cell imaging<\/td><\/tr>
                          TERS<\/td>Nanometer resolution<\/td>Nanotechnology, surface analysis<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                          These variants have transformed the Raman Effect from a laboratory curiosity into a versatile analytical technique, making it indispensable in modern science and technology.<\/p>\n\n\n\n

                          Raman Effect Application<\/h2>\n\n\n\n

                          The Raman Effect has moved far beyond being a laboratory discovery and is now a powerful tool across multiple fields of science, medicine, and industry. Its ability to provide a molecular fingerprint of substances without damaging them makes it highly valuable.<\/p>\n\n\n\n

                          1. Chemical and Material Analysis<\/h3>\n\n\n\n
                            \n
                          • Raman spectroscopy helps identify unknown substances’ molecular structure, bonding, and composition<\/span>.<\/li>\n\n\n\n
                          • Used in pharmaceuticals to check drug purity and counterfeit medicines.<\/li>\n\n\n\n
                          • Plays a major role in nanomaterials and polymer research.<\/li>\n<\/ul>\n\n\n\n

                            2. Medical and Biological Applications<\/h3>\n\n\n\n
                              \n
                            • Non-invasive detection of biomolecules like DNA, proteins, and lipids.<\/li>\n\n\n\n
                            • It helps in\u00a0cancer detection, as cancerous tissues have different Raman signatures from<\/span> healthy tissues.<\/li>\n\n\n\n
                            • Raman microscopy allows imaging of live cells without dyes, reducing risks to samples.<\/li>\n<\/ul>\n\n\n\n

                              3. Forensic Science<\/h3>\n\n\n\n
                                \n
                              • Used in crime investigations<\/strong> to detect trace amounts of drugs, explosives, or inks on documents.<\/li>\n\n\n\n
                              • Advantage: it works directly on samples without destroying them.<\/li>\n<\/ul>\n\n\n\n

                                4. Environmental Monitoring<\/h3>\n\n\n\n
                                  \n
                                • Detects air, soil, and water pollutants, toxins, and microplastics<\/span>.<\/li>\n\n\n\n
                                • Portable Raman spectrometers are used in fieldwork to track industrial pollution and hazardous chemicals.<\/li>\n<\/ul>\n\n\n\n

                                  5. Industrial Applications<\/h3>\n\n\n\n
                                    \n
                                  • Semiconductor industry<\/strong>: studies stresses and defects in silicon and other materials.<\/li>\n\n\n\n
                                  • Petroleum industry<\/strong>: analyzes fuel quality and contamination.<\/li>\n\n\n\n
                                  • Food industry<\/strong>: ensures product safety by identifying adulterants and monitoring freshness.<\/li>\n<\/ul>\n\n\n\n

                                    6. Astronomy and Space Exploration<\/h3>\n\n\n\n
                                      \n
                                    • NASA has included Raman spectrometers on missions to Mars (e.g., Perseverance Rover) to analyze soil and rock composition.<\/li>\n\n\n\n
                                    • Helps in the search for organic molecules and potential signs of life.<\/li>\n<\/ul>\n\n\n\n

                                      7. Art and Archaeology<\/h3>\n\n\n\n
                                        \n
                                      • Used in art conservation to identify pigments in paintings and sculptures.<\/li>\n\n\n\n
                                      • Non-destructive method that preserves priceless cultural heritage.<\/li>\n<\/ul>\n\n\n\n
                                        \"raman<\/figure>\n\n\n\n

                                        Quick Glance<\/h3>\n\n\n\n
                                        Field<\/strong><\/th>Applications<\/strong><\/th><\/tr><\/thead>
                                        Chemistry<\/td>Molecular structure, drug testing<\/td><\/tr>
                                        Medicine<\/td>Cancer detection, live-cell imaging<\/td><\/tr>
                                        Forensics<\/td>Explosives, drug detection<\/td><\/tr>
                                        Environment<\/td>Pollution monitoring, microplastics<\/td><\/tr>
                                        Industry<\/td>Semiconductors, food safety<\/td><\/tr>
                                        Space Science<\/td>Mars exploration, mineral study<\/td><\/tr>
                                        Art & Archaeology<\/td>Pigment identification, heritage preservation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                                        The Raman Effect’s versatility lies in its ability to provide fast, accurate, and non-destructive analysis, making it indispensable in research and real-world applications.<\/p>\n\n\n\n

                                        Importance of Raman Effect<\/h2>\n\n\n\n
                                          \n
                                        • Global Significance:<\/strong>\n
                                            \n
                                          • Discovered by Sir C.V. Raman in 1928, the effect revolutionized spectroscopy and earned him the Nobel Prize in Physics (1930).<\/li>\n\n\n\n
                                          • Positioned India on the global scientific map as a pioneer in physics research.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                          • Scientific Contributions:<\/strong>\n
                                              \n
                                            • A new branch of molecular spectroscopy was opened to study molecules’ vibrational and rotational structure.<\/li>\n\n\n\n
                                            • Provided a non-destructive technique to analyze solids, liquids, and gases.<\/li>\n\n\n\n
                                            • Helped understand molecular bonds, crystal structures, and chemical compositions.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                            • Technological Applications:<\/strong>\n
                                                \n
                                              • The basis of\u00a0Raman Spectroscopy is\u00a0widely used in modern industries and research.<\/span><\/li>\n\n\n\n
                                              • Essential in pharmaceuticals (drug testing, quality control).<\/li>\n\n\n\n
                                              • Plays a role in nanotechnology, materials science, and chemistry.<\/li>\n\n\n\n
                                              • Used in forensics for detecting trace evidence.<\/li>\n\n\n\n
                                              • Helps in geology for studying minerals and rock compositions.<\/li>\n\n\n\n
                                              • Necessary for environmental monitoring, like detecting pollutants in water or air.<\/li>\n\n\n\n
                                              • Applied in medical diagnosis, especially in cancer detection and imaging.<\/li>\n\n\n\n
                                              • Even used in space research, such as NASA\u2019s Mars missions, to analyze planetary surfaces.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                              • Broader Impact:<\/strong>\n
                                                  \n
                                                • A cornerstone discovery bridging science and technology.<\/li>\n\n\n\n
                                                • Continues to drive innovation across multiple fields worldwide.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

                                                  Limitations of Raman Effect<\/h2>\n\n\n\n

                                                  While the Raman Effect is globally significant, it also has limitations restricting its widespread use.<\/p>\n\n\n\n

                                                    \n
                                                  • Weak Intensity of Raman Scattering:<\/strong>\n
                                                      \n
                                                    • The intensity of Raman scattered light is extremely weak compared to the incident light.<\/li>\n\n\n\n
                                                    • Only about 1 in 10 million photons undergo Raman scattering, which makes detection difficult.<\/li>\n\n\n\n
                                                    • This requires highly sensitive detectors and precise instrumentation.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                                    • High Cost of Instruments:<\/strong>\n
                                                        \n
                                                      • Raman spectroscopy needs laser sources, sensitive detectors, and advanced optics.<\/li>\n\n\n\n
                                                      • These instruments are costly to build and maintain, making them less accessible for small laboratories or institutions with limited budgets.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                                      • Signal Interference:<\/strong>\n
                                                          \n
                                                        • Strong background signals, especially fluorescence emission, often interfere with Raman signals.<\/li>\n\n\n\n
                                                        • This can mask the actual spectrum and make analysis challenging.<\/li>\n\n\n\n
                                                        • To minimize interference, specialized techniques, such as resonance Raman spectroscopy or surface-enhanced Raman spectroscopy (SERS), are often required.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                                        • Technical Challenges:<\/strong>\n
                                                            \n
                                                          • Requires precise calibration and expertise to interpret data correctly.<\/li>\n\n\n\n
                                                          • Not always suitable for large-scale industrial applications due to complexity.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n

                                                            Despite these challenges, continuous technological advancements make Raman spectroscopy more efficient, sensitive, and accessible, ensuring its growing role in modern science.<\/p>\n\n\n\n

                                                            Raman Effect in UPSC \/ Competitive Exams<\/h2>\n\n\n\n

                                                            The Raman Effect frequently appears in UPSC, SSC, State PCS, and Railway exams due to its blend of scientific importance and Indian legacy. It is connected with questions on\u00a0Nobel Prize winners, physics concepts, and National Science Day (28<\/span> February).<\/p>\n\n\n\n

                                                            How it Appears in Exams<\/h3>\n\n\n\n
                                                              \n
                                                            • Direct questions: \u201cWhat is the Raman Effect?\u201d<\/li>\n\n\n\n
                                                            • Nobel Prize-based: Year (1930), Laureate (C.V. Raman).<\/li>\n\n\n\n
                                                            • Application-based MCQs on Raman Spectroscopy<\/strong>.<\/li>\n<\/ul>\n\n\n\n

                                                              Example Question<\/h3>\n\n\n\n

                                                              Q. Which of the following is related to the Raman Effect?<\/strong>
                                                              (a) Scattering of light
                                                              (b) Radioactivity
                                                              (c) Photoelectric effect
                                                              (d) Nuclear fission
                                                              Answer:<\/strong> (a) Scattering of light<\/p>\n\n\n\n

                                                              Quick Notes for Revision<\/h3>\n\n\n\n
                                                                \n
                                                              • Uses:<\/strong> Spectroscopy, material analysis, medical diagnosis<\/li>\n\n\n\n
                                                              • Discovered:<\/strong> 1928 by C.V. Raman<\/li>\n\n\n\n
                                                              • Award:<\/strong> Nobel Prize in Physics, 1930<\/li>\n\n\n\n
                                                              • Principle:<\/strong> Scattering of light with wavelength shift<\/li>\n<\/ul>\n\n\n\n

                                                                Conclusion<\/h2>\n\n\n\n

                                                                The Raman Effect, discovered by Sir C.V. Raman in 1928, is one of India’s most remarkable contributions to modern science. It explains how light scatters when passing through a medium, with some photons changing wavelength due to interactions with molecular vibrations. This fundamental discovery not only earned Raman the Nobel Prize in Physics in 1930, making him the first Asian to receive this honor in science, but also laid the foundation for Raman Spectroscopy, a powerful analytical tool.<\/p>\n\n\n\n

                                                                Today, its applications span multiple fields, including chemistry, physics, material science, medical diagnostics, forensic investigations, nanotechnology, and astronomy. Despite challenges like weak signal intensity and expensive instrumentation, its global importance remains unparalleled. In India, 28 February is celebrated as National Science Day to honor this discovery. For students and exam aspirants, the Raman Effect is a topic of both scientific and national significance.<\/p>\n\n\n\n

                                                                Frequently Asked Questions(FAQs)<\/h2>\n\n\n
                                                                \n
                                                                \n
                                                                \n

                                                                What is meant by the Raman effect?<\/h3>\n
                                                                \n\n

                                                                The Raman Effect<\/strong> is the phenomenon where light scatters off a molecule with a change in frequency due to energy exchange with the molecule\u2019s vibrational states. This effect, discovered by C. V. Raman, provides detailed information about molecular structure and is the basis of Raman spectroscopy.<\/p>\n\n<\/div>\n<\/div>\n

                                                                \n

                                                                Is sky blue due to Raman effect?<\/h3>\n
                                                                \n\n

                                                                No, the sky is not blue because of the Raman Effect\u2014the blue color results from Rayleigh scattering, where shorter blue wavelengths scatter more than red. The Raman Effect involves frequency shifts and does not significantly affect sky color.<\/p>\n\n<\/div>\n<\/div>\n

                                                                \n

                                                                How do you explain the Raman effect to kids?<\/h3>\n
                                                                \n\n

                                                                The Raman Effect happens when light hits something and bounces back with a tiny change in color because it shares energy with the material. It\u2019s like a light beam giving or taking a little energy while reflecting.<\/p>\n\n<\/div>\n<\/div>\n

                                                                \n

                                                                What is the Raman principle?<\/h3>\n
                                                                \n\n

                                                                The Raman principle<\/strong> states that when monochromatic light interacts with molecules, a small fraction of the scattered light changes frequency due to energy exchange with molecular vibrations. This frequency shift helps identify chemical structures using Raman spectroscopy.<\/p>\n\n<\/div>\n<\/div>\n

                                                                \n

                                                                What is raman effect discovery date?<\/h3>\n
                                                                \n\n

                                                                The Raman Effect was discovered on 28th February 1928<\/strong> by Sir C.V. Raman<\/strong> and his student K.S. Krishnan<\/strong> while experimenting with the scattering of sunlight.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"author":153,"featured_media":282804,"template":"","meta":[],"general-knowledge-category":[24741],"class_list":["post-281397","general-knowledge","type-general-knowledge","status-publish","has-post-thumbnail","hentry","general-knowledge-category-science"],"_links":{"self":[{"href":"https:\/\/www.cheggindia.com\/hi\/wp-json\/wp\/v2\/general-knowledge\/281397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cheggindia.com\/hi\/wp-json\/wp\/v2\/general-knowledge"}],"about":[{"href":"https:\/\/www.cheggindia.com\/hi\/wp-json\/wp\/v2\/types\/general-knowledge"}],"author":[{"embeddable":true,"href":"https:\/\/www.cheggindia.com\/hi\/wp-json\/wp\/v2\/users\/153"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cheggindia.com\/hi\/wp-json\/wp\/v2\/media\/282804"}],"wp:attachment":[{"href":"https:\/\/www.cheggindia.com\/hi\/wp-json\/wp\/v2\/media?parent=281397"}],"wp:term":[{"taxonomy":"general-knowledge-category","embeddable":true,"href":"https:\/\/www.cheggindia.com\/hi\/wp-json\/wp\/v2\/general-knowledge-category?post=281397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}