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Q.

Electron from n = 2 to n =1 in Hydrogen atom is made to fall on a metal surface with work function 1.2 eV. The maximum velocity of photo electrons emitted is nearly equal to

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a

6 x105 m/s

b

3 x105 m/s

c

2 x 105 m/s

d

85x 105 m/s

answer is D.

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Detailed Solution

Energy of the photon is equal to 13.6-3.4=10.2 eV kinetic energy of the photon is 10.2 -1.2 = 9 eV 12mv2= 9 x10-19  taking m =9 x 10-31kg  v=85 x105
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