1.

The shortest wavelength which can be obtained in hydrogen spectrum `(R=10 ^(7) m^(-1))`A. 1000 ÅB. 8000 ÅC. 1300 ÅD. 2100 Å

Answer» Correct Answer - A
The wavelemgth can be given as
`" "(1)/(lambda)=Z^(2)R((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))`
For `lambda` to the shortest `((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))` should be maximum
So, `" " n_(2)=oo and n_(1)=1`
Now, from Eq. (i) we get
`(1)/(lambda)=R((1)/(1))rArrlambda=(1)/(R)=(1)/(10^(7))m~~ 1000Å`


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