Question

List TWO phenomena which cannot be explain by Electromagnetic Wave Theory.

Answer 1

Answer: Photoelectric effect and generation of laser.

Explanation: Both photoelectric effect and generation of laser can be only explained by partical nature of light.

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Answer 2

Compton effect and Photoelectric Effect

Explanation:

Electromagnetic Wave theory could not explain the Compton effect and the photoelectric effect.

Compton effect and the photoelectric effect is explained by quantum theory in which light is treated as a particle.

The reason is as follows -

• In the photoelectric effect, as the light falls on the substance the electrons are emitted without any time delay and according to wave theory, the electrons are emitted after a small instant of time
• Compton effect is described by the classical theory of Thomson scattering that states the scattering of light from a charged particle by a wave. The wavelength of the emitted light is shifted due to the doppler effect if the electron is accelerated