Marketing Mix: Pricing. Price is the overall sacrifice a consumer is willing to make to acquire a specific product or service. Price includes not just the financial amount, but also the time and effort a consumer must sacrifice for the product or service.
How many quarks are in a proton? How many quarks are in a neutron? Protons and neutrons each contain three quarks. A proton is composed of two 'Up' quarks and one 'Down' quark while neutrons are composed of one 'Up' quark and two 'Down' quarks. Author: Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon) Related Pages: All About Atoms
These masses represent a strong departure from earlier approaches which treated the masses for the U and D as about 1/3 the mass of a proton, since in the quark model the proton has three quarks. The masses quoted are model dependent, and the mass of the bottom quark is quoted for two different models. But in other combinations they contribute different masses. In the pion, an up and an anti-down quark yield a particle of only 139.6 MeV of mass energy, while in the rho vector meson the same combination of quarks has a mass of 770 MeV!