The penetrating power of \( \mathrm{X} \)-ray increases with the (A) Increase of its velocity (B...

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The penetrating power of \( \mathrm{X} \)-ray increases with the
(A) Increase of its velocity
(B) Increase in its intensity
\( \mathrm{P} \)
(C) Decrease in its velocity
(D) Increases in its frequency.
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