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प्रश्न
Which one of the following has least penetrating power?
विकल्प
beta particles
alpha particles
γ-rays
none of these
MCQ
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उत्तर
Alpha particles
Explanation:
α-particles are heavy and charged, so they lose energy quickly and cannot penetrate far. Penetrating power increases from α to β to γ, so α-particles have the least penetrating power.
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