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The least energetic wave number in the P...

The least energetic wave number in the Paschen series is

A

5R/16

B

R/4

C

R/9

D

7R/144

Text Solution

Verified by Experts

The correct Answer is:
D
For least wave number in Paschen series `p=3` and `n=4`
`:. 1/lambda = R [1/p^(2) -1/n^(2)]=R[1/9-1/16]`
`bar(lambda)=1/lambda=(7R)/(144)`
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