The ratio of the wavelengths of last lines of Balmer and Lyman series is-

(A) 4:1

(B) 27:5

(C) 3:1

(D) 9:4

 

(A) The wavelength of a spectral line may be given by the following expression-

For lymen series n1 =1. For Balmer series n1 =2

For the last line in both the series n2 

For Lyman series

For Balmer series

 

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