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The largest wavelength in the ultraviole...

The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is

A

802 nm

B

823 nm

C

1882 nm

D

1648 mn

Text Solution

Verified by Experts

The correct Answer is:
B
Lyman series emits UV radiation
` :. 1/lambda = R (1/(1^(2))-1/(2^(2)))`
`rArr " " 1/(122xx10^(-9))=R(3/4)`
And Paschen series emits IR radiation (lowest wavelength )
`1/lambda =R (1/(3^(2))-1/(oo^(2)))=R/9`
`:. " " lambda/122 =3/4 xx 9 = 27/4`
` rArr " " lambda = 823 ` nm .
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