The ratio of wavelength of the lest line of Balmer series and the last line Lyman series is:

Options

A. 1
B. 4
C. 0.5
D. 2

Explanation

Last line of Balmer
`n_(1)=2" "n_(2)=oo`
`1/(lamda_(n))=Rz^(2)[1/(2^(2))-1/(oo)]`
`1/(lamda_(z))=(Rz^(2))/4`
Last line of Lyman
`n_(1)=1" "n_(2)=oo`
`1/(lamda_(1))=Rz^(2)[1/(1^(2))-1/(oo)]`
`1/(lamda_(1))=Rz^(2)`
`(lamda_(2))/(lamda_(1))=4`