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Question: The element which has K<sub>a</sub> X-ray line whose wavelength is 0.18 nm is –...

The element which has Ka X-ray line whose wavelength is 0.18 nm is –

A

Iron

B

Cobalt

C

Nickel

D

Copper

Answer

Cobalt

Explanation

Solution

Frequency corresponding to wavelength of 0.180 nm is

= c/l = 1.67 × 1018 Hz

From Mosley's law

n = 34\frac { 3 } { 4 } cR (Z – 1)2 (Z – 1) = = 26

Hence element is cobalt.