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An electron jumps from nth level to the...

An electron jumps from nth level to the first level .The correct face (s) about H atomic is//are

A

Number of specteal lines ` = sum (n(n-1))/2`

B

Number fo spectal lines ` = sum ( n-1)`

C

Number fo spectal lines ` = sum ( n-1)`

D

If ` n=4` the no.of spectral lines = six.

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The correct Answer is:
A, B, D
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