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Question

During the emission spectrum of electron in He+ ion, the electron on transition from same higher energy state drops to the ground state and first excited state emits two photon of λ1=304 A and λ2=1085 A respectively.The total number of photons emitted during the transition of electrons from highest excited to all lower energy level(Possible)


A

15

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B

12

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C

6

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D

10

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Solution

The correct option is D

10


1λ1=RnZ2(1n21-1n22)

n1=1 λ1=304 A,z=2,Rn=1.1 × 107m1

n2=2 (lower excited state)

For first excited state

1λ2=RnZ2(1n21-1n22)

n1=2 λ2=1085 A

Therefore, total number of spectral lines=(51)(51+1)2

=10


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