Consider α-particles, β-particles and γ-rays each having an energy of 0.5 MeV. In increasing order of penetrating powers..

Q: Consider α-particles, β-particles and γ-rays each having an energy of 0.5 MeV. In increasing order of penetrating powers, the radiations are

(A) α, β, γ

(B) α, γ , β

(C) β, γ , α

(D) γ, β , α

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Ans: (A)
Sol: Penetrating Power depends upon Speed ,

Hence Penetrating Power of :

α-particles > β-particles > γ-rays