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Q.

Out of the following, which are NOT emitted by a radioactive substance?

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a

Electrons

b

Electromagnetic radiations

c

Helium nuclei with a charge equal to that of two protons

d

Neutrons

answer is D.

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Detailed Solution

Following are the processes of radioactive decay:

(i) Alpha decay: helium nuclei with a charge equal to that of two protons is emitted.

(ii) Beta decay: electrons are emitted from nucleus.

(iii) Gamma decay: gamma radiation (electromagnetic radiation) is emitted in this process.

Hence, neutrons are not emitted during radioactive decay.

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