Identify which of the following particles can be shielded just by a piece of paper?

proton

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neutron

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alpha particle

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gamma ray

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beta particle

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Solution

The correct option is A alpha particle
Alpha particles are fast-moving helium nuclei, the beta particles are fast-moving electrons, and gamma particles are high energy photons.
Alpha particles can be stopped by a sheet of paper, beta particles by aluminum, and gamma radiation by a block of lead. Gamma radiation can penetrate very far into a material, and so it is gamma radiation that poses the most danger when working with radioactive materials

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