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An electron changes its position from or...

An electron changes its position from orbit n=3 to the orbit n=4 of an atom. The wavelength of the emitted radiations is (R = Rydberg's constant)

A

`144/R`

B

`144``/``3``R`

C

`144``/``5``R`

D

`144``/``7``R`

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The correct Answer is:
D
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