Question

50% of the X-rays coming from a Coolidge tube are able to pass through a 0.1 mm thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the X-rays passing through the same foil will be
(a) 0%
(b) < 50%
(c) 50 %
(d) > 50%

Answer 1

Among the x-rays coming from the Coolidge tube, 50% of them are able to pass through the 0.1 mm thick aluminium foil. When the potential difference between the filament and the target is increased, the x-rays fraction passing through the same foil will be (d) > 50%.

Explanation:

The x-rays penetrating power differences directly with the electrons accelerating potential (V) or the x-rays energy. Thus, if the potential difference between the filament and the target is raised, then there will be an increment in the X-rays fraction passing via the foil.