Question

A proton has a radius of about 1 fm (10−15 m). Use dimensional analysis with the speed of light c=3×108 m/s, the reduced Plank constant ℏ=1.1×10−34 Js to estimate the kinetic energy of quarks inside a proton. Recall the conversion between Joules and electron volts, 1 eV=1.6×10−19 J, and that MeV = mega electron volts, i.e. 1 MeV=106 eV.