α- particles, β – particles and γ – rays are all having same energy. Their penetrating power in a given medium in increasing order will be

Options

(a) β, γ, α
(b) γ, α, β
(c) α, β, γ
(d) β, α, γ

Correct Answer:

α, β, γ

Explanation:

Increasing order of penetrating power : α