First slide

X-rays

Question

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

Easy

A

50%
B

> 50%
C

< 50%
D

<10%

Solution

$E_{\max} \propto V$ 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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