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(A) The penetrating power of $X$-rays is directly proportional to their energy.According to the relation $E = eV$,where $E$ is the energy of the $X$-r

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Accelerating potential

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(A) The penetrating power of $X$-rays is directly proportional to their energy.According to the relation $E = eV$,where $E$ is the energy of the $X$-ray photon,$e$ is the elementary charge,and $V$ is the accelerating potential applied across the $X$-ray tube.As the accelerating potential $V$ increases,the energy of the $X$-rays increases,which in turn increases their penetrating power.Therefore,the correct option is $A$.

Penetrating power of $X$-rays increases with an increase in

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