Question

The mass of a proton is \[1.00727~\mathrm{u}\], which corresponds to:

Options

• \[1.660539 \times 10^{-27}~\mathrm{kg}\]

• \[1.67262 \times 10^{-27}~\mathrm{kg}\]

• \[1.6749 \times 10^{-27}~\mathrm{kg}\]

• \[9.1 \times 10^{-31}~\mathrm{kg}\]

Answer 1

The mass of a proton is \[m_p = 1.00727~\mathrm{u} = 1.67262 \times 10^{-27}~\mathrm{kg}\]. It is slightly less than the neutron mass \[1.6749 \times 10^{-27}~\mathrm{kg}\], which is why the neutron is described as having a mass very nearly the same as that of a proton.