1.

The wavelength of K_(alpha) line of an X-ray spectrum of an element of atomic no. Z= 11 is alpha.. The wavelength of same line of element of atomic no. Z' is 4lamda, then Z' is :

Answer»

4
6
44
11

Solution :By Mosley.s law
`V=^(2)(z-B)^(2)`
`(v_(1))/(v_(2))=((z_(1)-b)^(2))/((z_(2)-b)^(2))`
But `v=(c)/(lambda)`
`(lambda_(2))/(lambda_(1))=((z_(1)-1)^(2))/((z_(2)-1)^(2))`
`(4LAMBDA)/(lambda)=((11-1)^(2))/((z.-1)^(2))=4`
Then `z=6`


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