Question

Assertion (A): $\beta$ -particles are very effective projectiles for transmutation.

Reason (R): $\beta$ -particles are negatively charged particles having very small mass and hence very small momentum.

• A. Both A and R are true and R is correct explanation of A
• B. Both A and R are true and R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

Answer: (D)

A is false but R is true

Neutrons are effective projectile for Transmutations as they are large as compared to mass and have very large momentum as they have very large mass just opposite to nature of $\beta -particles$ which are nothing but stream of fast moving electrons and thus they are negatively charged particles having very small mass and thus having very less momentum.