Q.

50% of  X-rays obtained from a Coolidge tube pass through  0.3mm thick aluminum foil. If the potential difference between the target and the cathode is increased, then the fraction of X-rays  passing through the same foil will be

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a

50%

b

> 50%

c

< 50%

d

<10%

answer is B.

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Detailed Solution

Emax∝V so on increasing V, energy of incident electron increases. Due to which X−rays produced will be of higher energy. So the penetrating X−rays percentage will increase.Therefore, the correct answer is ( B )
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50% of  X-rays obtained from a Coolidge tube pass through  0.3mm thick aluminum foil. If the potential difference between the target and the cathode is increased, then the fraction of X-rays  passing through the same foil will be