he sun is powered through a nuclear fusion process by which four protons are combined to produce one alpha particle (He nucleus) and two positrons. (Positrons have the same mass as electrons.) 4a) What is the numerical value of the rest energy of a proton in Joules? b) What is the numerical value of the rest energy of a positron in Joules? c) What is the numerical value of the rest energy of an alpha particle in Joules? (The mass of an alpha particle is the mass of a He atom minus the mass of two positrons.) d) Numerically what is the mass difference (in kg ) between four protons and one alpha particle plus two positrons? e) What is the percentage mass difference between four protons and an alpha plus two positrons? f) Numerically, how much energy in Joules is released through the conversion of one kilogram of protons ( N protons) to N/4 alpha particles and N/2 positrons? (It is a good approximation to multiply 1 kg by the fractional mass difference from part e [= percentage mass difference/100] to find the mass converted to energy.)