Q:

The term ‘radioactive’ when applied to the nucleus of an atom refers to which one of the following phenomena?

belongs to book: Examination Questions and Answers in Basic Anatomy and Physiology|Martin Caon|| Chapter number:17.2| Question number:18

waelhammad

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2022-10-21

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The term ‘radioactive’ when applied to the nucleus of an atom refers to which one of the following phenomena?

The spontaneous emission of a particle or of electromagnetic radiation.
The emission of x-rays, gamma rays, alpha particles or beta particles.
The formation of a daughter nucleus by the decay of a parent nucleus.
The spontaneous emission from a nucleus which has the optimum ratio of neutrons to protons.

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waelhammad

2022-10-21

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A: Choice B is wrong as x-rays don’t come from a nucleus. Choice C is wrong as sometimes a nucleus is in an “excited” state and returns to ground state by emitting a gamma ray while the nuclear structure is unchanged. Choice D is wrong as a nucleus which has the optimum ratio of neutrons to protons is not unstable.

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