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# Waves

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### Waves

1. 1. Waves
2. 2. Slinky Waves A wave is caused by a vibrating source, and travels outwards from the source. The particles of the medium through which a wave travels move about their equilibrium positions; they do not move along with the wave. Energy is transferred from place to place by a wave.
3. 3. To think about <ul><li>Does the size of a pulse change as it travels along the spring?  </li></ul><ul><li>What is there was no friction? </li></ul><ul><li>What happens when a pulse reflects at the fixed end? (we need to clamp the slinky at one end) </li></ul><ul><li>How does the speed change if you change the tension? (does not work well, should be the same) </li></ul><ul><li>What happens if pulses set off from opposite ends at the same time? </li></ul>
4. 4. What you are going to achieve today <ul><li>By the end of the lesson you will know </li></ul><ul><li>What are the differences between transverse and longitudinal waves? </li></ul><ul><li>What is a plane-polarised wave? </li></ul><ul><li>What physical test can distinguish transverse waves from longitudinal waves? </li></ul><ul><li>What is meant by the amplitude of a wave? </li></ul><ul><li>Between which two points can the wavelength be measured? </li></ul><ul><li>How is the frequency of a wave calculated from its period? </li></ul><ul><li>What is phase? </li></ul>
5. 5. Important wave diagram