Dual Nature of Radiation and Matter — Important Questions
Maharashtra Board · Class 12 · Physics
44 important questions from Dual Nature of Radiation and Matter for Maharashtra Board Class 12 Physics, with answers. Written for the board exams 2027.
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Important Questions from Dual Nature of Radiation and Matter
Which of the following observations from photoelectric effect could NOT be explained by wave theory?
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Instantaneous emission of electrons, Existence of threshold frequency, Independence of KE_max on intensity, Linear relation between stopping potential and frequency
Wave theory could not explain: (1) instantaneous emission (2) threshold frequency (3) KE_max independent of intensity (4) linear V₀-ν relation. Only photocurrent dependence on intensity was explainable by wave theory.
Which of the following demonstrate wave nature of matter?
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Electron diffraction, Davisson-Germer experiment, Thomson's experiment
Wave nature of matter is demonstrated by electron diffraction experiments (Davisson-Germer and Thomson). Compton scattering and photoelectric effect show particle nature of radiation.
In photoelectric effect, stopping potential depends on:
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Frequency of incident light, Work function of metal
From eV₀ = hν - φ₀, stopping potential V₀ depends on frequency ν and work function φ₀, but not on intensity or surface area.
A photon has energy 4 eV. Its momentum is:
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2.13 × 10⁻²⁷ kg⋅m/s
p = E/c = (4 × 1.6×10⁻¹⁹ J)/(3×10⁸ m/s) = 2.13 × 10⁻²⁷ kg⋅m/s
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