Alpha-particles are

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protons

positron

neutrally charged

ionized helium atoms

answer is D.

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Detailed Solution

We know that alpha particles are the nuclei of ionized helium atoms which contain two protons and two neutrons. These are emitted by the nuclei of certain radioactive substances. Streams of alpha particles, called $α$ -rays, produce intense ionisation in gases through which they pass and are easily absorbed by matter.

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