Question 50
Modern PhysicsThe photocell works on the principle of the
- A.voltaic cell
- B.emission of electrons by incident radiation
- C.emission of protons by incident electrons
- D.photographic plate.
Show the answer and explanation
Answer: B (emission of electrons by incident radiation)
Explanation
In a photocell, light falling on a metal surface knocks out electrons (the photoelectric effect), which form a current.