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Which element has a K(alpha) line of wa...

Which element has a ` K_(alpha)` line of wavlength 1.785Å ?

A

Copper

B

cobalt

C

Sodium

D

Aluminium

Text Solution

Verified by Experts

The correct Answer is:
B
We know that, `(1)/(lambda_(k_alpha))=R(Z-1)^(2)((1)/(1^(2))-(1)/(2^(2)))`
`" " (Z-1)^(2)=(4)/(3)xx(1)/(lambda_(k_(alpha))R)=680`
`" " (Z-1)=26`
`" " Z=27to` cobalt
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