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 =2to n = 1

B

n = 4 to n = 3

C

n = 3 to n = 1

D

n = 4 to n = 2

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The correct Answer is:

B

Since ,`lambda prop 1/(DeltaE) rArr f prop DeltaE`
`E_(4to3) lt E_(4 to2) lt E_(2to1) lt E_(3to1)` .

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