1.

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)

Answer»

802 nm
823 nm
1882 nm
1648 nm

Solution :LARGEST wavelength in UV region corresponds to transition. N=2 to n=1
i.e. `1/(122)=R (1/1^(2)-1/2^(2))..........(i)`
SMALLEST wavelength in UR region is given by transition `noo" to "n=3`
`1/lambda =R (1/3^(2)-1oo) ............(ii)`
Solving equation (i) and (ii), `lambda=823.5nm`


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