Question

Choose the answer that explains the photoelectric effect. Metallic plates emit protons only when light of a certain minimum frequency shines on them. Metallic plates emit electrons when the cumulative effect of light causes electron movement. Metallic plates emit electrons only when light of a certain maximum frequency accumulates energy. Metallic plates emit electrons only when light of a certain minimum frequency shines on them.

Answer 1

Metallic plates emit electrons only when light of a certain minimum frequency shines on them.

Step-by-step explanation:

Answer 2

Metallic plates emit electrons only when light of a certain minimum frequency shines on them.

Step-by-step explanation:

For the photoelectric effect to take place there is a minimum amount of energy required in the impinging photon of light to be able to remove an electron according to the metal in question.

The energy of a photon is proportional to its frequency, therefore there is a minimum frequency required in the incident light to be able to emit an electron.