What is the stopping potential for photoelectrons ejected from a photosensitive material of work function 1.6 eV when it is irradiated by photons of energy 2.4 eV?
A
0.8 V
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B
2.0 V
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C
4.0 V
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D
None of these
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Solution
The correct option is A 0.8 V Energy of photon, E=2.4eV
Work function ϕ=1.6eV
We kow that, eV0=E−ϕ⇒eV0=(2.4−1.6)eV⇒V0=0.8V
Hence, the correct choice is (a).