1.

The wavelength of K_(alpha) line from an element of atomic number 41 is lamda. Then the wavelength of K_(alpha) line of an element of atomic number 21 is :

Answer»

`4lamda`
`(lamda)/(4)`
`3.08lamda`
`0.26lamda`

Solution :`(lambda_(2))/(lambda_(1))=((Z_(1)-1)^(2))/((Z_(2)-1)^(2))=((40)/(20))^(2)=4`


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