Dual Nature of Radiation and Matter: Class 12 Physics Q&A
5 free answers on Dual Nature of Radiation and Matter (Physics) for Class 12 students, across CBSE, ICSE and State boards. Includes questions such as “what is Raman effect?”, “What is threshold frequency?”, “What is the work function φ?”
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Questions
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what is Raman effect?
The Raman effect, named after Indian physicist Sir C. V. Raman who discovered it in 1928, is a phenomenon in molecular spectroscopy where light undergoes inelastic scattering upon interacting with matter. Specifically, when monochromatic light (light of a single wavelength) is incident on a sample, most of the scattered light has the same frequency as the incident light (Rayleigh scattering). However, a small fraction of the scattered light has different frequencies due to interactions with m
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What is threshold frequency?
Threshold frequency refers to the minimum frequency of electromagnetic radiation (usually light) that is required to initiate a specific phenomenon, such as the photoelectric effect or other photoelectric phenomena. It is a concept associated with the interaction of light and matter, particularly with the behavior of electrons in a material when illuminated by light. Photoelectric Effect: The most well-known context for threshold fr
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C V Raman
Sir Chandrasekhara Venkata Raman, commonly known as C V Raman, was an Indian physicist who made groundbreaking contributions to the field of light scattering, earning the Nobel Prize in Physics in 1930 for his discovery of what is now called the Raman Effect. Born on November 7, 1888, in Tiruchirapalli, Tamil Nadu, Raman demonstrated exceptional academic brilliance from childhood, completing his master's degree in physics at age 18. Despite initially working in the Indian Finance Service, his
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What is the work function φ?
The work function φ (phi) represents the binding energy of electrons at a material's surface. Different materials have different work functions: Sodium: ~2.3 eV Aluminum: ~4.2 eV Gold: ~5.1 eV In the photoelectric effect: hν = φ + KE_max, where hν is photon energy and KE_max is maximum kinetic energy of emitted electrons.
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What is a work function in physics?
The work function (φ) is the minimum energy required to remove an electron from a solid's surface to a point just outside. Key points: Symbol: φ (phi) or W Unit: Electron volts (eV) or joules Application: Photoelectric effect, thermionic emission Formula: Energy of incident photon - work function = kinetic energy of ejected electron (hν = φ + KE)