Hard X-rays for the study of fractures in bones should have a minimum wavelength of 10⁻¹¹ m. The accelerating voltage for electrons in X-ray machine should be

Options

(a) <124.2 kV
(b) >12.4 KV
(c) between 60 kV and 70 kV
(d) (=100 kV)

Correct Answer:

>12.4 KV

Explanation:

Minimum Wavelength λ = hc / eV = (1.242 × 10⁻⁶) / V

V = (1.242 × 10⁻⁶) / 10⁻¹¹ = 124.2 kV

The accelerating voltage for electron in X-ray is 124.2 kV