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The wavelength of k(alpha) X- rays prod...

The wavelength of `k_(alpha) ` X- rays produced by an X - rays tube is `0.76 Å` . The atomic number of the anode material of the tube is …….

A

20

B

60

C

40

D

80

Text Solution

Verified by Experts

The correct Answer is:
C
`lambda ` of X - ray lines is given by Rydberg
`1/lambda = RZ^(2) (1/(n_(1)^(2))-1/(n_(2)^(2)))`
for `k_(alpha)` line , `n_(1)` = 1 and `n_(2)` = 2
` :. ` From above relation
`1/lambda = RZ^(2) (3/4)rArrZ = (4/(3Rlambda))^(1/2)`
`rArr Z = [4/(3xx(1.097xx10^(7))(0.76xx10^(-10)))]^(1/2) approx 40 `
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