Question

When a metal with work function 0.6 eV is illuminated with light of energy 2 eV, the stopping potential will be ____________.

Options

• 2.8 eV

• 0.7 V

• 1.4 V

• 4.2 eV

Answer 1

When a metal with work function 0.6 eV is illuminated with light of energy 2 eV, the stopping potential will be 1.4 V.

`phi_0 = 0.6  "eV"`

E = hv = 2eV

∴ maximum energy = (2 - 0.6) eV = 1.4 eV

∴ Stopping potential= 1.4 V