Across
- 1. The size of vibrations or the maximum distance a particle moves away from its resting position when a wave passes.
- 3. A group of waves that all travel at the same speed in a vacuum, and are all transverse.
- 5. Any substance through which something travels.
- 7. The boundary between two materials.
- 10. The distance between a point on one wave and the same point on the next wave.
- 12. The number of vibrations (or the number of waves) per second.
- 14. The unit for frequency. One hertz is one wave per second.
- 15. Vibrations in the particles of a solid, liquid or gas, which are detected by our ears and ‘heard’ as sounds.
Down
- 2. A wave where the vibrations are at right angles to the direction the wave is travelling.
- 4. The change in direction when waves go from one medium to another.
- 6. The speed of an object in a particular direction. Usually measured in metres per second (m/s).
- 8. A wave where the particles vibrate in the same direction as the wave is travelling.
- 9. A way of transferring energy or information. Many waves travel when particles pass on vibrations.
- 11. The time taken for one complete wave to pass a point. It is measured in seconds.
- 13. An imaginary line at right angles to a surface where a ray of light hits it.
- 15. Vibrations in the rocks of the Earth caused by earthquakes or explosions.