A Hard One !

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Across
  1. 3. Ohms Law only applies when this is constant
  2. 5. What happens to the drag on an object as its speed increases
  3. 9. Object that does not transmit visible light
  4. 10. Momentum is mass time the change of this
  5. 11. This end of the visible spectrum has most energy
  6. 12. Helium nucleus is one of these particles
  7. 15. This always stays the same when a wave travels from one medium to another
  8. 16. Which colour light has the longest wavelength
  9. 17. Unit of wave frequency
  10. 18. Turning effect of a force
  11. 19. Particles in a solid do this
  12. 21. What can be done to reduce drag on an object
  13. 22. Displacement is this type of quantity
  14. 23. Atomic number is the number of these in an atom
Down
  1. 1. type of reflection where a rough surface causes scattering of light
  2. 2. A measure of how difficult it is to change an object's velocity.
  3. 4. Pressure is measured in these
  4. 6. Electric current x time
  5. 7. To measure potential difference you need one of these
  6. 8. What is the resultant force on an object moving at steady speed in a straight line.
  7. 13. S Waves cannot travel through this
  8. 14. Gradient of a graph of velocity against time gives this
  9. 20. Area of longitudinal wave where particles are pulled apart