16-14

2. The most convent energy unit for atoms and visible light
5. A combination of two protons and two neutrons, a He4 nucleus
6. A form of the same element that contains the same atomic number but have different numbers of neutrons
7. An invisible particle that saves conservation of energy, angular momentum, and lepton number
9. High energy EMR produced by nuclear events
10. Combinations of quarks, held together neutrons and protons to make up the nucleus of atoms
11. Was invented for the theory of how microscopic particles behave
14. consists of waves of electric and magnetic fields which manage to produce each other
16. Held together quarks
17. A particle with 211 electron masses that are remarkably close
18. Observed the properties of neutron and found that it has a mass about that of a proton but has no charge
19. Electrons that come from nuclear events
20. the best prospective theory of "everything"

1. In calculating energy per photon (E=hf), h stands for:
3. An instrument that can show individual atoms on a surface
4. A generic name for electrons and their relatives mu and tau, and the associated neutrinos
8. Was measured in the Milliken Oil Drop Experiment
12. Combinations of which make up neutrons, protons, and lots of more massive but short lived relatives
13. A meson that is the primary force carrier for the nuclear force
15. An antimatter electrons predicted by Dirac