A nucleus containing $60$ nucleons has a radius $R.$

Part A

The radius of a nucleus containing $180$ nucleons would be closest to

$3^{\frac{2}{3}}R=2\mathrm{.}08R.$

$3R.$

$\sqrt[\phantom{2}]{3}R=1\mathrm{.}73R.$

$3^{\frac{1}{3}}R=1\mathrm{.}44R.$

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