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  1. α-particles, β-particles and γ-rays are all having same energy. Their penetrating power in a given medium in increasing order will be
    1. β, γ, α
    2. γ, α, β
    3. α, β, γ
    4. β, α, γ
Correct Option: C

Increasing order of penetrating power :
<α <β <γ
For same energy, lighter particle has higher penentrating power.



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