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(c) isotope of parent
                  (d) isobar of parent
            10.   Consider α and β particles and γ-rays each having an energy of 0.5 MeV. In the increasing order
                  of penetrating power, the radiation are respectively
                  (a) α, β, γ
                  (b) α, γ, β
                  (c) β, γ, α
                  (d) γ β, α
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