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Question

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200nm falls on it, must be
  1. 2.4V
  2. 1.2V
  3. -1.2V
  4. -2.4V

A
-1.2V
B
1.2V
C
-2.4V
D
2.4V
Solution
Verified by Toppr

Work function of metal surface ϕ=5.01 eV
Wavelength of incident photon λ=200 nm
Energy of incident photon E=1240λ (innm) eV=1240200=6.21 eV
Stopping potential eVo=Eϕ
eVo=6.215.01=1.2eV
Vo=1.2 V

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