Sunah's puzzle

1234567891011121314151617181920
Across
  1. 2. various phenomena that occur when a wave encounters an obstacle or opening
  2. 4. the branch of applied mathematics dealing with motion and forces producing motion
  3. 5. my teacher calls himself___?
  4. 7. a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects
  5. 8. an electromotive force or potential difference expressed in volts
  6. 10. each device is placed in its own separate branch
  7. 14. difficulty of passing current through wires
  8. 15. the fourth planet from the Sun and the second-smallest planet in the Solar System
  9. 18. natural phenomenon by which all things with mass or energy
  10. 19. neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen
  11. 20. carry the electromagnetic force
Down
  1. 1. energy of speed
  2. 3. any motion of a body where gravity is the only force acting upon it
  3. 6. a sun or suns orbited by planets, comets, asteroids, and dust
  4. 9. quantitative measure of inertia
  5. 11. force*distance
  6. 12. a mixture of rock and frozen gases
  7. 13. carry the color, strong, force
  8. 16. What is the creator's name of this puzzle?
  9. 17. a device that stores electrical energy in an electric field