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Question

What is the composition of alpha particles?
  1. Doubly ionised helium nuclei
  2. Helium atoms
  3. A stream of neutrons
  4. A positive charged

A
Doubly ionised helium nuclei
B
A positive charged
C
A stream of neutrons
D
Helium atoms
Solution
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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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