Photoelectric effect supports quantum nature of light because: (a) There is a minimum frequency of light below which no photoelectrons are emitted. (b) The maximum kinetic energy of the photoelectrons depends only on the frequency of the light and not on its intensity. (c) Even when the metal surface is faintly illuminated, the photoelectrons leave the surface immediately. (d) Electric charge of the photoelectrons is quantized.

The correct answer is
(a) There is a minimum frequency of light below which no photoelectrons are emitted.
(b) The maximum kinetic energy of the photoelectrons depends only on the frequency of the light and not on its intensity.
(c) Even when the metal surface is faintly illuminated, the photoelectrons leave the surface immediately.

A photoelectron’s maximum kinetic energy increases with an increase in the frequency of incident light. In this case, the frequency should exceed the threshold limit. Maximum kinetic energy is not affected by the intensity of light.

Photoelectric effect

What is the photoelectric effect?

The photoelectric effect is a phenomenon in which electrons are ejected from the surface of a metal when light is incident on it. These ejected electrons are called photoelectrons. The process through which photoelectrons are ejected from the surface of the metal due to the action of light is commonly referred to as photoemission.

How does the photoelectric effect occur?

The photoelectric effect occurs because the electrons at the surface of the metal tend to absorb energy from the incident light and use it to overcome the attractive forces that bind them to the metallic nuclei. An illustration detailing the emission of photoelectrons as a result of the photoelectric effect is provided below.

Photoelectric Effect

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