Which of the following has least penetrating power?

Alpha particles

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Gamma rays

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Beta particles

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All have the same penetrating power

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Solution

The correct option is A Alpha particles
The penetrating power of alpha particles, beta particles, and gamma rays varies greatly. Alpha particles can be blocked by a few pieces of paper. Beta particles pass through paper but are stopped by aluminium foil. Gamma rays are the most difficult to stop and require concrete, lead, or other heavy shielding to block them.

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The radioactive radiations which have the least penetrating power.

γ

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