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Which one of the following has the greatest mass?

1. Alpha particle
2. Beta particle
3. Neutron
4. Gamma ray E . Positron

Correct answer: Alpha particle

Solution

An alpha particle is a helium nucleus, containing 2 protons and 2 neutrons, so it has much more mass than a beta particle, positron, or gamma ray. A neutron is heavy, but still less massive than an alpha particle.

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