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Which of the transitions in hydrogen ato...

Which of the transitions in hydrogen atom emits a photon of lowest frequecny `(n =` quantum number)?

A

`n_(2) = alpha` to `n_(1) = 2`

B

`n_(2) = 4` to `n_(1) = 3`

C

`n_(2) = 2` to `n_(1) = 1`

D

`n_(2) = 5` to `n_(1) = 3`

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The correct Answer is:
C
For any series the first line have lowest have length and highest energy.
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