1.

Find the wavlength of the K_(alpha) line in copper (Z=29) if the wavelength of the K_(alpha) line in iron (Z=26) is known to be equal to 193 p m.

Answer»

SOLUTION :From Moseley's LAW
`omegak_(alpha)=(3)/(4)R(Ƶ-1)^(2)`
or `lambdak_(alpha)=(4)/(3R)(1)/((Ƶ-1)^(2))`
Thus `(lambdak_(alpha)(Cu))/(lambdak_(alpha)(Fe))=((25)/(28))^(2)=((Ƶ_(Fe)-1)/(Ƶ_(cu)-1))^(2)`
Substitution gives
`lambdak_(alpha)(Cu)= 153.9p m`


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