Question

State the effect of the following changes on the X-rays emitted by Coolidge X-ray tube : 

(i) High voltage between cathode and anode is increased.
(ii) Filament temperature is increased.

Answer 1

(i) We know,

`lambda = 1.22/sqrt"V"  Å`, where V is the accelerating potential in volt. 

If V increases wavelength λ will decrease i.e., harder X-rays will be produced.

(ii) When the temperature increases, the number of electrons emitted by the filament increases. As a result, the intensity of X-rays increases.