Question

X-ray from a Coolidge tube is incident on a thin aluminium foil. The intensity of the X-ray transmitted by the foil is found to be I0. The heating current is increased to increase the temperature of the filament. The intensity of the X-ray transmitted by the foil will be
(a) zero
(b) < I0
(c) I0
(d) > I0

Answer 1

The intensity of the x-ray transmitted by the foil will be (d) > I0.

Explanation:

It is understood that the x-ray’s intensity is directly proportional to x-ray tube’s current that is passing through it. When the current in the filament is increased to raise the filament temperature, there will be emission of more electrons from the filament per unit time. As a consequence, the x-ray tube’s current will raise and the x-ray intensity will also increase.