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Which one of the series of hydrogen spec...

Which one of the series of hydrogen spectrum is in the visible region ?

A

Lyman series

B

Balmer series

C

Paschen series

D

Bracket series

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(lamda)= R ((1)/(n_(1)^(2))- (1)/(n_(2)^(2)))`
for Balmer series `n_(1) = 2`,
Let `n_(2) rarr oo` (for shortest wavelength)
`(1)/(lamda)= 1.097 xx 10^(7) ((1)/(4)) rArr lamda= (4 xx 10^(-7))/(1.097) ~~400nm`
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