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Light of photon energy 4.2 eV falls on a metal with work function 2.2 eV. What is the stopping potential?
A6.4 V
B1.9 V
C4.2 V
D2.0 V
Answer & Solution
Correct answer: D. 2.0 V
eV0 = 4.2 eV minus 2.2 eV = 2.0 eV, so V0 = 2.0 V.
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