From what meterial is the anod of an X-ray tube made if the `K_alpha` line wavelength of thej characteristic spectrum is `0.76 Å`?

Answer

A, D

Explanation

`(1)/(lambda_(K_alpha) = R(Z-1)^2 ((1)/(n_1^2) - (1)/(n_2^2))`
or `(1)/(0.76xx10^(-10) = 1.097xx10^7 (Z-1)^2 (1 - (1)/(4)`
Solving this equation, Z =41.