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Physics · 2023 · 1 mark
CBSE 2023 · Region 3 · Set 1 · Q18
Assertion (A): The nucleus _3^7 X is more stable than the nucleus _3^4 Y. Reason (R):_3^7 X contains more number of protons.
Assertion (A): The nucleus $\displaystyle { }_{3}^{7} \mathrm{X}$ is more stable than the nucleus $\displaystyle { }_{3}^{4} \mathrm{Y}$. Reason $\displaystyle (R): \quad{ }_{3}^{7} \mathrm{X}$ contains more number of protons.
Official answer
(C)
Assertion (A) is true, but Reason (R) is false.
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CBSE Class 12 Physics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.