Which of the following phenomena can not be explained by wave theory of light ?
- (A)Reflection of light
- (B)Diffraction of light
- (C)Refraction of light
- (D)Compton effect✓ Correct
Answer: (D)
Solution
The wave theory of light explains reflection, refraction and diffraction as consequences of the wave nature of light — these phenomena follow from Huygens' principle applied to a continuous wavefront.
The Compton effect involves the scattering of a photon by a free electron, with a measurable increase in wavelength that depends on the scattering angle. This shift can only be accounted for by treating light as discrete quanta of momentum colliding elastically with electrons — a purely particle picture. Wave theory has no mechanism for a wavelength shift on scattering, so it cannot explain the Compton effect.
The Compton effect involves the scattering of a photon by a free electron, with a measurable increase in wavelength that depends on the scattering angle. This shift can only be accounted for by treating light as discrete quanta of momentum colliding elastically with electrons — a purely particle picture. Wave theory has no mechanism for a wavelength shift on scattering, so it cannot explain the Compton effect.
JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Single correct option