What is the composition of alpha particles?

A positive charged

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Doubly ionised helium nuclei

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A stream of neutrons

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Helium atoms

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Solution

The correct options are
A Doubly ionised helium nuclei
D A positive charged
Alpha particles are positively charged and are doubly ionised helium nuclei.

An alpha particle is a fast moving packet containing two protons and two neutrons (a helium nucleus). Alpha particles carry a charge of +2 and strongly interact with matter. Produced during alpha decay, alpha particles can travel only a few inches through air and can be easily stopped with a sheet of paper.

Hence, the correct options are $A$ and $B$

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