Question

If the energy of a photon is 25 eV and the work function of the material is 7 eV, then the value of stopping potential is –

• A. 3 V
• B. 9 V
• C. 18 V
• D. 27 V

Answer 1

Answer: (C)

18 V

Answer 2

eV₀ = 25 eV – 7 eV

V₀ = 18V