Across
- 4. An imaginary line at right angles to a surface where a ray of light hits it
- 5. The speed of an object in a particular direction
- 8. The boundary between two materials
- 10. Waves A group of waves that all travel at the same speed in a vacuum and are all transverse
- 11. A wave where the vibrations are at right angles to the direction the wave is travelling
- 12. The size of vibrations or the maximum distance a particle moves away from its resting position when a wave passes
- 13. The time taken in seconds for one complete wave to pass a point
- 14. The unit for frequency. One is equal to one wave per second.
Down
- 1. The change in direction when waves go from one medium to another
- 2. The number of vibrations (or the number of waves) per second
- 3. A wave where the particles vibrate in the same direction as the wave is travelling
- 6. The distance between a point on one wave and the same point on the next wave
- 7. Any substance through which something travels
- 9. vibration Vibrations in rocks of the earth caused by earthquakes or explosions