The most penetrating radiation out of the following is :-

X-rays

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$β - r a y s$

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$α - p a r t i c l e s$

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$γ - r a y s$

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Solution

The correct option is D
$γ - r a y s$

The penetration power order is $α - p a r t i c l e s$ < $β - r a y s$ < X-rays < $γ - r a y s$
$γ - r a y s$ have the short wavelengths of all electromagnetic radiation and has the greatest penetration power.
Hence the option D is correct.

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