igcse phy terminologies

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Across
  1. 2. the distance from one crest of the wave to the next
  2. 4. which obeys the law: indecent angle equals to reflected angle
  3. 5. ratio of speed of light in a vacuum to speed of light in the material
  4. 6. When wave pass through a gap, they spread out into the space
  5. 7. the maximum displacement of a particle in the wave
  6. 10. at one particular Ange, the refracted ray emerges along and parallel to the surface of the block
  7. 12. such a current that flows in the same direction all the time
  8. 14. the areas of the sound wave where the air molecules are close together
  9. 16. an induced current always flows in such a way that its magnetic field opposes the change that causes its
  10. 17. other form of energy is converted to electrical energy per unit charge, 1v=1j/1c
  11. 19. the areas of the sound wave where the air molecules are close together
  12. 20. can be made by passing a current through a coil of wire-solenoid
  13. 21. number of vibrations per second
  14. 22. time taken for one vibration
  15. 23. a space where current/magnet/moving charge will experience force
Down
  1. 1. which obeys snell’s law, bending of rays of light when they travel from one material to another
  2. 3. electrical energy is converted to other of form of energy per unit charge ,1v=1j/1c
  3. 8. the particles carrying the wave move back and forth, along the direction in which the wave is moving
  4. 9. rage of flow of flow of electric charge
  5. 11. If the angle of incidence is greater than critical angle, the light is entirely reflected
  6. 13. the particles carrying the wave move form side to side, at right angles to the direction in which the wave is moving
  7. 15. ratio of potential difference to current
  8. 18. a region where charged object will experience a force