Across
- 3. the minimum mass of fissionable material in a rector or nuclear bomb that will sustain a chain reaction
- 5. The statement that the frequencies of some spectral lines of the elements are either the sums or the differences of the frequencies of two other lines.
- 12. fission the splitting of the nucleus of a heavy atom into two smaller nuclei
- 13. high-frequency electromagnetic radiation emitted but the nuclei of radioactive atoms.
- 14. The combination of light atomic nuclei to form heavier nuclei, with the release of much energy
- 16. force that attracts nucleons to each other within the atomic nucleus: a force that is very strong for short distances
- 17. The theory of the micro world based on wave functions and probabilities developed especially by Werner Heisenberg and Erwin Schroedinger.
- 20. the time required for half the atoms in a sample of a radioactive isotope to decay
- 21. a stream of electrons (or positrons) emitted during the radioactive decay of certain nuclei
- 22. nucleus positively charged center of an atom, containing protons and neutrons and almost the entire mass of the atom, but only a tiny fraction of its volume
Down
- 1. a stream of particles (helium nuclei) ejected by certain radioactive elements
- 2. a self-sustaining reaction in which the products of one reaction event stimulate further reaction events
- 4. A fundamental equation of quantum mechanics, which relates probability wave amplitudes to the forces acting on a system
- 5. acronym for a unit of absorbed energy
- 6. the conversion of n atomic nucleus of one element into an atomic nucleus of another element through a loss or gain in the number of protons.
- 7. a nuclear proton or neutron; the collective name for either or both.
- 8. The rule that a new theory must produce the same results as the old theory where the old theory is known to be valid
- 9. the elementary constituent particles or building blocks of nuclear matter
- 10. negative particle in the outer part of an atom
- 11. process of the atomic nucleus that results in the emission of energetic sub atomic particles
- 15. acronmy for a unit used to measure the effect of ionizing radiation on humans.
- 18. process of determining the time that has elapsed since death by measuring the radioactivity of the remaining carbon14 atoms
- 19. Electromagnetic radiation of higher frequencies than ultraviolet: emitted by electron transitions to the lowest energy states in atoms
- 21. a fission reactor designed to make more fissionable fuel tun is put into it by converting non fissionable isotopes to fissionable isotopes