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10 June, 23:23

Which particle has a mass that is approximately the same as the mass of a proton?

(1) an alpha particle (3) a neutron

(2) a beta particle (4) a positron

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  1. 11 June, 01:02
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    Protons have a mass of 1

    Alpha particles are Helium nuclei, so have mass 4

    Beta particles are electrons, and so have mass 0

    Neutrons have mass 1

    Positrons are anti-matter forms of electrons, and so have mass 0

    The answer is (3) a neutron
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