What are waves?
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## Contents

- Introduction
- Learning outcomes
- 1 How do you make a wave?
- 2 Restoring forces
- 3 Types of wave
  - 3.1 Transverse waves
  - 3.2 Longitudinal waves
- 4 Graphical representation of waves
- 5 Sound and hearing
  - 5.1 Echolocation
  - 5.2 Ultrasound imaging
- Conclusion
- References
- Acknowledgements

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