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Q.

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

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a

6 ×105 m/s

b

3 ×105 m/s

c

2 ×105 m/s

d

18 ×105 m/s

answer is D.

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Detailed Solution

KEmax=E-Wo ∴12mVmax2=13.6z21n12−1n22−Wo ∴12×9×10−31Vmax2=13.6(1)2112−122−1.2eV ∴12×9×10−31Vmax2=[10.2−1.2]eV ∴12×9×10−31Vmax2=9×1.6×10−19 ∴Vmax=18×105ms−1
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Electrons from n=2 to n=1 in Hydrogen atom is made to fall on a metal surface with work function 1.2ev. The maximum velocity of photo electrons emitted is nearly equal to