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# 6.2 Describing waves

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Introduce wavelength and amplitude for longitudinal and transverse waves, Show that wavespeed depends on the medium and frequency depends on the source, Introduce the wave equation

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### 6.2 Describing waves

1. 1. 10 October 2010<br />6.2 Describing Waves<br />Write down two similarities between longitudinal and transverse waves<br />Write down two differences<br />Give an example of each<br />
2. 2. Aims<br />Introduce wavelength and amplitude for longitudinal and transverse waves<br />Show that wavespeed depends on the medium and frequency depends on the source<br />Introduce the wave equation<br />
3. 3. x<br />amplitude<br />t<br />Wavelength<br />
4. 4.
5. 5. Amplitude, A<br />The maximum distance that each point in the medium moves from its normal position as the wave passes<br />Measured in metres, m<br />
6. 6. Frequency, f<br />This is the number of waves that pass any point in the medium every second, so it is the same as the number of vibrations per second<br />Frequency is measured in per seconds or hertz, 1/s, s-1 or Hz<br />
7. 7. Wave speed, v<br />This is the speed at which each wave crest moves through the medium.<br />Measured in metres per second, m/s or ms-1<br />
8. 8. Wavelength, λ<br />This is the length of a complete wave measured from any point to the next identical point – the distance is always the same no matter which point you choose<br />It is measured in metres, m<br />
9. 9.
10. 10. Can we figure the equation out?<br />
11. 11.
12. 12. Where:<br />v = speed of wave / m/s<br />f = frequency of wave / Hz (1/s)<br />λ = wavelength of wave / m<br />
13. 13. How can we prove this?<br />What would happen if we increased the wavelength of a wave?<br />What would happen if we decreased the wavelength of a wave?<br />