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(D) The penetrating power of $X-$rays is determined by their energy,which is directly related to their frequency and inversely related to their wavele

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Current in the filament

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(D) The penetrating power of $X-$rays is determined by their energy,which is directly related to their frequency and inversely related to their wavelength. Increasing the potential difference between the cathode and anode increases the kinetic energy of the electrons,which in turn increases the energy and penetrating power of the $X-$rays. However,the current in the filament only controls the number of electrons emitted from the cathode (thermionic emission). Increasing the filament current increases the intensity (number of photons) of the $X-$rays produced,but it does not change the energy of individual photons. Therefore,the penetrating power does not depend on the current in the filament.

Penetrating power of $X-$rays does not depend on

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