Question 50
Modern PhysicsA light of energy 5 eV falls on a metal and the electrons with a maximum kinetic energy of 2 eV are ejected. The work function of the metal is
- A.0.4 eV
- B.2.5 eV
- C.3.0 eV
- D.7.0 eV
Show the answer and explanation
Answer: C (3.0 eV)
Explanation
Photon energy = work function + maximum kinetic energy, so work function = 5 − 2 = 3.0 eV.