Calculate an Estimate of the Range of a Hypothetical Force

Multiple Choice

Calculate an estimate of the range of a hypothetical force with the proton as the virtual exchange particle. $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } , m _ { \text {proton } } = 1.67 \times 10 ^ { - 27 } \mathrm {~kg} \right)$

A) $1.5 \times 10 ^ { - 15 } \mathrm {~m}$
B) $6.7 \times 10 ^ { - 25 } \mathrm {~m}$
C) $2.1 \times 10 ^ { - 16 } \mathrm {~m}$
D) $6.0 \times 10 ^ { - 8 } \mathrm {~m}$