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Q.

Which stable nucleus has radius half than that of $^{56} Fe$

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a

$^{40} Ca$

b

$^{7} Li$

c

${}^{32}S$

d

$^{23} Na$

answer is D.

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Detailed Solution

r_nucleus $\infty$ ${(A)}^{\frac{1}{3}}$

Unknoen nucleus = X

$\frac{r_{n}}{r_{x}} = {(\frac{56}{A_{x}})}^{\frac{1}{3}}$

${(2)}^{3}$ = $\frac{56}{A_{X}}$

A_x = 7

nucleid = ${}_{3}{Li}^{7}$

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