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The first emission line of Balmer series...

The first emission line of Balmer series in H spectrum has the wave number equal to :

A

`( 9 R_(H))/(400)cm^(-1)`

B

`( 7 R_(H))/(144)cm^(-1)`

C

`( 3 R_(H))/(4)cm^(-1)`

D

`( 5 R_(H))/(36)cm^(-1)`

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The correct Answer is:
D
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