Physics crosswords

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Across
  1. 5. who discovered electron
  2. 10. word that means Amount in physics
  3. 11. This phenomenon powers the sun
  4. 13. Physics that deals with heat and temperature
  5. 14. Neutral or no charge
  6. 17. Instrument used to measure current
  7. 19. Law that describes refraction
  8. 20. Variable resistance is also called
Down
  1. 1. PV=NKT what is K?
  2. 2. Waves that doesn't require a medium
  3. 3. Visible color with shortest wavelength
  4. 4. Physics that deals with motion
  5. 6. physics that deals with light,vision and color
  6. 7. Physics that deals with tiny objects
  7. 8. Not Discrete but ?
  8. 9. Joule/second
  9. 12. SI unit of current
  10. 15. upper part of a wave
  11. 16. foil Material used in Rutherford experiment
  12. 18. Physics that deals with sound