Consider \( \alpha \)-particles, \( \beta \)-particles \& \( \gamma \) rays, each having an ener...

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Consider \( \alpha \)-particles, \( \beta \)-particles \& \( \gamma \) rays, each having an energy of \( 0.5 \mathrm{MeV} \). Increasing order of penetrating powers, the radiations are :
\( P \)
(A) \( \alpha, \beta, \gamma \)
(B) \( \alpha, \gamma, \beta \)
(C) \( \beta, \gamma, \alpha \)
(D) \( \gamma, \beta, \alpha \)
W.
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