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
2.4V
1.2V
-1.2V
-2.4V
A
-1.2V
B
1.2V
C
-2.4V
D
2.4V
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Solution
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Work function of metal surface ϕ=5.01eV Wavelength of incident photon λ=200nm Energy of incident photon E=1240λ(innm)eV=1240200=6.21eV Stopping potential eVo=E−ϕ ∴eVo=6.21−5.01=1.2eV ⟹Vo=1.2V
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