Question

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 

(a) < 124.2 kV 

(b) > 124.2 kV 

(c) between 60 kV and 70 kV 

(d) = 100 kV.

Answer 1

The correct option is (b) > 124.2 kV 

Explanation:

The accelerating voltage for electrons in X-ray machine should be greater than 124.2 kV.

Comments

The accelerating voltage should be less than 124KV cause the wavelength given is minimum wavelength hence the voltage will always be less as the denominator will only increase making 124KV the maximum voltage.
So the correct answer is option (a)