Find the radius of nucleus of an atom having atomic mass number equal to 125. $(T a k e R_{0} = 1.3 \times 10^{- 15} m)$

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Solution

The formula for calculating radius of nucleus
$R = R_{0} \times A^{(1 / 3)}$
where A =atomic mass
$R = (1.3 \times 10^{- 15}) (125)^{(1 / 3)}$
= $1.3 \times 10^{- 15} \times 5$
$R = 6.5 \times 10^{- 15} m$
$T h e r e f o r e, t h e r a d i u s o f n u c l e u s o f a n a t o m i s 6.5 \times 10^{- 15}$ .

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Ans: __________________ $X 10^{- 15} m$

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