Question

When the voltage applied to an X-ray tube increased from V₁ =10 kV to V₂ = 20 kV, the wavelength interval between the K_α line and the short-wave cut-off of the continuous X-ray spectrum increases by a factor n = 3.0. Find the atomic number of the element of which the tube's anticathode is made.

Answer 1

Suppose λ₀ = wavelength of the characteristic X-ray line. Then using the formula for short wavelength limit of continuous radiation