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Q.

From Lyman series to Pfund series, frequency          

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a

Decreases

b

Increase or decrease

c

Increases

d

No change 

answer is B.

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Detailed Solution

From Lyman to Pfund series energy decreases and wavelength increases. Then frequency decreases because both wavelength and frequency are inversely proportional to each other. Lyman series observed in U.V region Pfund series observed in far I.R region

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