Moseley’s equation for the characteristic X-ray frequency is given as
= a (z – b)
where v is the frequency of characteristic X-ray produced from a nucleus having at. no. z; and a and b are constants for a particular series of x-rays.
Wave lengths of Ka lines of Mg and Cr are 0.987 nm and 0.229 nm respectively. The values of the constants a and b for this series should be