The ionizing power and the penetration range of radioactive radiations increase in the order:

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$α, β, γ$ and $α, β, γ$ respectively.

$α, β, γ$ and $γ, β, α$ respectively.

$γ, β, α$ and $γ, β, α$ respectively.

$γ, β, α$ and $α, β, γ$ respectively.

answer is B.

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Detailed Solution

Out of the three radioactive radiations, the $α$ -rays are the most ionizing but least penetrative while the $γ$ -rays are the least ionizing but most penetrative:

(i) α,β and γ radiations are arranged in the ascending order with respect to their penetrating power as:α < β < γ.
(ii) α,β and γ radiations are arranged in the ascending order with respect to their ionizing power as:γ < β < α.

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