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(B) The energy of an $X-$ray photon is given by the equation $E = h
u$,where $h$ is Planck's constant and $
u$ is the frequency of the radiation.Pen

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Increase in its frequency

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(B) The energy of an $X-$ray photon is given by the equation $E = h
u$,where $h$ is Planck's constant and $
u$ is the frequency of the radiation.Penetrating power is directly proportional to the energy of the $X-$ray photons.Since $E \propto 
u$,as the frequency $
u$ increases,the energy of the photons increases.Consequently,the penetrating power of the $X-$rays increases with an increase in their frequency.

The penetrating power of $X-$rays increases with the

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