Photoelectric effect is the phenomenon of
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Emission of electrons from a metal surface when illuminated by a light of suitable frequency.
The photoelectric effect is the emission of electrons (photoelectrons) from a metal surface when light of frequency above the threshold frequency of the metal falls on it. Below the threshold no electrons are emitted, however intense the light.
NCERT (2026-27):
Summary – “… Photoelectric effect is the phenomenon of emission of electrons by metals when illuminated by light of suitable frequency.”