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Question

Which one α,β or γ radiation has the least penetrating power?

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Solution

An Alpha (α) rapidly dissipates its energy as it ionise the medium due to its high mass and size. Therefore, its penetrating power is quite small. It can penetrate only through 3 to 8 cm in air. The penetrating power of γ-radiations is high. It is about 104 times that of α-particles and 102 times that of β-particles.
Order of penetration power : Alpha (α) < Beta (β) < Gamma rays (γ)

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