Question

²¹⁰₈₄P₀ originally at rest emits α - particles of KE ‘K’. Find the KE of recoiling nucleus.

• A. $\frac{4}{214}K$
• B. $\frac{4}{206}K$
• C. $\frac{K}{206}$
• D. $\frac{K}{214}K$.

Answer 1

Answer: (B)

$\frac{4}{206}K$

Answer 2

206. v' = 4v

KE of recoiling nucleus = $\frac{1}{2}$ (206) (v')²

= $\frac{1}{2}(206)\left( \frac{4v}{206} \right)^{2}orK' = \frac{4}{206}K$.