Wavelength of `K_(a)` line of X-ray spectra varies with atomic number as

Options

A. `lambda prop Z`
B. `lambda prop sqrtZ`
C. `lambda prop (1)/(Z^(2))`
D. `lambda prop (1)/(sqrtZ)`

Answer

C

Explanation

According to moseley.s law, `sqrtV = a(Z-b) or V = c/(lambda) = a^(2)(Z-b)^(2) therefore lambda infty (1)/(Z^(2))`