Question

why alpha and beta are called particles whereas gamma called radiations?

Answer 1

Alpha, Beta and Gamma rays all are types of radiations emitted after radioactive decay of an unstable atomic nucleus known as Alpha decay, Beta decay and Gamma decay respectively. Alpha Rays are high speed particles. ... Alpha 'rays' are actually particles - a helium nucleus consisting of two protons and two neutrons.

Answer 2

Alpha rays are high-speed nucleus of 4He2 atom there fore it's a particle ray

Also, beta rays are high speed electrons so they are also particle rays

However gamma ray is a pure form of energy released by a heavy radioactive nucleus due to instability caused by excess of energy and are therefore not particle rays.

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