NATS 1870 Lecture 9: Lectures 9-14

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Matter: any substance that has mass and occupies space made up of atoms. A nucleus made up of protons and neutrons: protons: (+) electric charge, elections: (-) electric charge, neutrons: no charge (elementary/fundamental particle; no internal structure) Photons: elementary/fundamental particle w/ a discrete (tiny packet) of electromagnetic (light) energy. P(cid:396)ope(cid:396)ties : carries energy proportional to the radiation frequency (if f changes, e changes as well, has zero rest mass, moves at a constant velocity of c = 3 x 108m/s, can destroy/create energy (radiation) when absorbed/emitted. Almost all the mass of an atom is in the nucleus. Nuclear force: bond of p+ and n0. Quarks: elementary/fundamental particles that make up p+ and n0: su(cid:271)st(cid:396)u(cid:272)tu(cid:396)e is u(cid:374)k(cid:374)o(cid:449)(cid:374) = do(cid:374)(cid:859)t k(cid:374)o(cid:449) if is (cid:272)o(cid:373)posed of othe(cid:396) pa(cid:396)ti(cid:272)les. Surrounded by e- that are housed in valiant shells. Absorption: incoming photon (wavelength (cid:895) and energy (cid:894)e=h(cid:272)/ (cid:895) hits an e- w/in an atom.

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