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Question

Calculate the total number of spectral lines in the UV region, during the transition from the 5th excited state to the 1st excited state in a sample of Hydrogen atoms.

A
10
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B
3
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C
4
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D
\N
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Solution

The correct option is C 4
Maximum number of spectral lines (N) corresponding to transition from n1=5 to n2=1 are:
N= number of lines emitted =12(n1n2)(n1n2+1)
=12(51)(51+1)
=10
All transitions in lyman series fall under UV spectrum.
Therefore, transitions under UV spectrum are four(51,41,31 and 21)
Number of possible transitions =4

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