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Q.

Incident photon energy on metal plate is 7 eV. The maximum K.E of emitted photo electrons is 2 eV. The work function of the plate is

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a

5 eV

b

1.7 eV

c

1 eV

d

3 eV

answer is A.

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Detailed Solution

ϕ 0=hυ−Max  k.E=7−2=5eV

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