(A) $\gamma$ rays are high-energy electromagnetic radiation emitted from the nucleus of a radioactive atom. They have no mass and no charge. They are

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High energy electromagnetic waves

(A) $\gamma$ rays are high-energy electromagnetic radiation emitted from the nucleus of a radioactive atom. They have no mass and no charge. They are represented by the symbol $\gamma$ and their energy is given by $E = h\nu$,where $h$ is Planck's constant and $\nu$ is the frequency. Therefore,option $A$ is correct.