Multiple choice

Photo-electric effect is the phenomenon of __________.

  1. ejection of electrons from a metal plate when light of a suitable wavelength falls on it

  2. production of alpha-rays

  3. production of beta-rays

  4. production of gamma-rays
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The photoelectric effect occurs when photons of sufficient energy (above a threshold frequency) strike a metal surface and eject electrons. This phenomenon provided key evidence for quantum theory, showing light behaves as discrete packets of energy (photons). It is not about producing radioactive particles (alpha, beta, or gamma rays).

Keep practicing — related questions