Estimate the Radius of a Nucleus with Mass $50 \mathrm { u }$

Multiple Choice

Estimate the radius of a nucleus with mass $50 \mathrm { u }$ . ( $m _ { \text {neutron } } \approx m _ { \text {proton } } = 1.67 \times 10 ^ { - 27 } \mathrm {~kg}$ )

A) about $4.4 \mathrm { fm }$
B) about $3.7 \mathrm { fm }$
C) about $6.2 \mathrm { fm }$
D) about $8.5 \mathrm { fm }$