6. The distance from one point on a wave to the same point on a wave to the same point on next waves.
- Trough
- Wavelength
- Sound
- Frequency
7. The number of waves that go past a particular point in one seconds
- Longitudinal wave
- Frequency
- Reflected wave
- Wave length
8. How fast does sound travel in liquid ?
- 1250m/s
- 2500m/s
- 1500m/s
- 1000m/s
