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Find the wavelength of the K(alpha) lin...

Find the wavelength of the `K_(alpha)` line in copper `(Z=29)`, if the wave length of the `K_(alpha)` line in iron `(Z=26)` is known to be equal to `193 "pm"` (Take `b=1`)

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The correct Answer is:
154
By Mosely law `(1)/(lamda)prop(Z-1)^(2)`
`(lamda_(2))/(193)=((26-1)^(2))/((29-1)^(2))`
`lamda_(2)=(193xx25^(2))/(28^(2))`
`lamda_(2)=153.8" pm"~-154` pm
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