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Question
Photoelectric effect is ______.
Options
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
Solution
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.
