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Statement A: Density of nucleus is independent of its mass number Statement B: Beryllium is used as a moderator in nuclear reactors

1. Both A and B are correct
2. Both A and B are wrong
3. A is correct,B is wrong
4. A is wrong,B is correct

Correct answer: A is correct,B is wrong

Solution

Nuclear radius grows roughly as A^(1/3), so nuclear volume grows as A, making density approximately constant and independent of mass number. Beryllium is not the standard moderator; materials like graphite and heavy water are used to slow neutrons effectively.

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