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Question: The ratio of the frequencies of the long wavelength limits of the Lyman and Balmer series of hydroge...

The ratio of the frequencies of the long wavelength limits of the Lyman and Balmer series of hydrogen is –

A

27 : 5

B

5 : 27

C

4 : 1

D

1 : 4

Answer

5 : 27

Explanation

Solution

l(longest) for Balmer series = (36/5R)

l(longest) for Lyman series = (4/3R)

\ Ratio = 43\frac{4}{3}× 536\frac{5}{36} = 527\frac{5}{27}