Question

Photoelectric effect is ______.

विकल्प

• emission of electrons by insulators when illuminated by light of suitable frequency

• emission of electrons by metals when illuminated by light of suitable frequency

• emission of electrons by glass when illuminated by light of suitable frequency

• emission of electrons by metals when heated

Answer 1

Photoelectric effect is emission of electrons by metals when illuminated by light of suitable frequency.

Explanation:

When light strikes a metal surface, the light energises electrons on the metal's surface, which are then emitted from the surface. It is discovered that below a particular frequency of light, there will be no photoemission from a metal surface. The photoelectric effect is the phenomenon of a metal surface-emitting photoelectrons when exposed to light of a sufficient frequency.