Physics Conundrum

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Across
  1. 3. negatively charged
  2. 5. german theoretical physicist
  3. 7. divide speed of wave by wavelength
  4. 8. mass divided by volume
  5. 10. body of matter with no shape
  6. 13. product of mass and velocity
  7. 14. has an atomic number
  8. 15. power by physical or chemical resources
  9. 16. resistance
  10. 17. electromagnetic radiation seen by human eye
  11. 18. attraction towards the center of the earth
  12. 20. SI unit of of electric current
Down
  1. 1. ice is an example of this state of water
  2. 2. rate of change of velocity of an object
  3. 4. resistance to change in state of motion
  4. 6. force per unit area
  5. 9. disturbance or oscillation
  6. 11. speed in a given direction
  7. 12. heaviness of a person or thing
  8. 19. smallest unit of matter