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Photons of 5.0 eV hit a metal of work function 2.0 eV. The stopping potential is
A2.0 V
B3.0 V
C5.0 V
D7.0 V
Answer & Solution
Correct answer: B. 3.0 V
Maximum kinetic energy is 5.0 - 2.0 = 3.0 eV, so a retarding potential of 3.0 V stops the electrons.
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