Question 41
Modern PhysicsLight of energy 5 eV falls on a metal of work function 3 eV and electrons are liberated. The stopping potential is
- A.15.0 V
- B.8.0 V
- C.2.0 V
- D.1.7 V
Show the answer and explanation
Answer: C (2.0 V)
Explanation
Maximum KE of the electrons = 5 − 3 = 2 eV, so a stopping potential of 2.0 V is needed.