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Q.

If  kα radiation of Mo (Z=42) has a wavelength of 0.71Å . Calculate the wavelength of the corresponding radiation of Cu (Z=29) in Å .

[Round-off to two decimal places]

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answer is 1.52.

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Detailed Solution

By Mosley’s law, we have f=aZ−b
ForKα  radiation, b= 1, also  f=cλ
∴1λ∝Z−12
Now,λcuλMo=Zmo−12ZCu−12=42−1229−12
On substituting λMo=0.71A0

and solving, we get λCu=1.52A0.

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