Physics Crossword Competition

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Across
  1. 5. An elementary particle and a fundamental constituent of matter
  2. 6. A discrete unit or package of light energy
  3. 9. A process that occurs without the transfer of thermal energy
  4. 11. Area of low pressure (expansion) in a longitudinal wave
  5. 12. The unit of power for a converging lens:
  6. 14. A quantity with magnitude only
  7. 16. Change in momentum
  8. 18. The medium on which light waves were once presumed to propagate.
  9. 19. The angle of incidence for a light ray, below which total internal reflection occurs.
  10. 20. A cylindrical coil of wire that becomes electromagnetic when a current runs through it
Down
  1. 1. An electrically neutral subatomic particle.
  2. 2. A nuclear reaction in which two or more atomic nuclei join together
  3. 3. The bending or spreading of a wave when it passes through a small opening (aperture) or around a barrier
  4. 4. Collection of neighboring points on a wave that are in phase
  5. 7. A is a semiconductor device used to amplify or switch electronic signals and electrical power.
  6. 8. Top of a transverse wave
  7. 10. A process that occurs at constant pressure
  8. 13. An instrument that is used to measure current.
  9. 15. Locations of maximum constructive interference on a standing wave
  10. 17. A system property that expresses the degree of disorder in the system