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The ratio of wavelenghts of photons emit...

The ratio of wavelenghts of photons emitted when hydrogen atom de-excites from third excieted state to second excited state then de-excities form second excited state to first excited state is :

A

`7/5`

B

`27/20`

C

`27/5`

D

`20/7`

Text Solution

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The correct Answer is:
D
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