# Nuclei

Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Nuclei” of Physics.

• Q1.A radioactive nucleus ‘A’ undergoes a series of decays according to the following scheme :
$A\stackrel{\alpha }{\to }{A}_{1}\stackrel{\beta }{\to }{A}_{2}\stackrel{\alpha }{\to }{A}_{3}\stackrel{\gamma }{\to }{A}_{4}$

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• Q2.The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an

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• Q3.In a sample off radioactive substance, what percentage decays in one mean life time?

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• Q4.

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• Q5.Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the samples of A and B have equal number of nuclei. Find the ration of remaining number of A and B nuclei after 80 minutes.

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• Q6.

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• Q7.

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