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Question

The shortest wavelength of Lyman series of Hydrogen atom is λ. If an electron jumps from a higher energy level to ground state and emits a photon of wavelength 9λ/8, the principal quantum number of that higher energy level is


A

2

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B

3

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C

4

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D

9

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Solution

The correct option is B

3


1λ=R(1n21m2).For shortest wave length m=. This gives R=1λ.89λ=1λ(1121m2).Solve this you get m=3}


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