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(C) The penetrating power of radioactive radiations follows the order: $\alpha$-rays $< \beta$-rays $< \gamma$-rays. Since $\alpha$-particles are heav

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Less than $\beta$-rays

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(C) The penetrating power of radioactive radiations follows the order: $\alpha$-rays $Since $\alpha$-particles are heavy and carry a $+2$ charge,they have the lowest penetrating power compared to $\beta$-particles and $\gamma$-rays. Therefore,the penetrating power of an $\alpha$-particle is less than that of $\beta$-rays. Hence,the correct option is $(C)$.

The penetrating power of an $\alpha$-particle is:

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