# Number of visible lines when an electron returns from 5th orbit to ground state in H spectrum :

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Number of visible lines when an electron returns from 5th orbit to ground state in H spectrum :
A. 5
B. 4
C. 3
D. 10

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Shortest wave length of Lyman series of H-atom
1/lambda=1/x=R[1/((1)^(2))-1/((oo)^(2))] So, x=1/R
For Balmes series
1/lambda=R (1)^(2){1/((2)^(2))-1/((3)^(2))}
1/lambda=1/x xx5/36 so, lambda=(36 x)/(5)