Assertion :A nucleus having enrgy $E_{1}$ decays by $β$ emission to daughter nucleus having energy $E_{2}$ but the $β$ -rays are emitted with a continuous energy spectrum having end point energy $E_{1} - E_{2}$ . Reason: To conserve energy and moment in $β$ decays at least three particles must take part in the transformation.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Assertion :-
A nucleus having energy $E_{1}$ decays by $B$ emission to daughter nucleus having energy $E_{2}$ but the $β$ rays are emitted with a continuous energy spectrum having end point energy $E_{1} - E_{2}$
Reason
To consume energy and moment in $β$ decays at least three particles must take part in the transformation.
This will be the correct assertion and reason and reason is the correct explanation for assertion.

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