Atoms And Nuclei Question 42

Question: The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is [KCEE 1996]

Options:

A) 27 : 5

B) 5 : 27

C) 4 : 1

D) 1 : 4

Show Answer

Answer:

Correct Answer: A

Solution:

For Lyman series
νLymen=cλmax=Rc[1(1)21(2)2]=3RC4
For Balmer series
νBalmer=cλmax=Rc[1(2)21(3)2]=5RC36 \ νLymenνBalmer=275



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