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प्रश्न
The least penetrating radiation is ______.
विकल्प
α - particles
β - particles
X - rays
γ - radiations
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उत्तर
The least penetrating radiation is α - particles.
Explanation:
An α - particle rapidly loses its energy as it moves through a medium, and therefore its penetrating power is quite small. It can penetrate only through 3–8 cm in air. It can easily be stopped by a thin card sheet or a thick paper.
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