The penetration power of a proton is:

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(B) The penetration power of a particle is inversely proportional to its mass. Since a proton is approximately $1837$ times heavier than an electron,i

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Less than an electron

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(B) The penetration power of a particle is inversely proportional to its mass. Since a proton is approximately $1837$ times heavier than an electron,its ability to penetrate matter is significantly lower than that of an electron. $	ext{Penetration power} \propto \frac{1}{	ext{mass}}$ Therefore,the penetration power of a proton is less than that of an electron.

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