# Waves

transverse and longitudinal waves

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• Created by: Harri
• Created on: 13-06-11 17:59

## Transverse Waves

if you fix one end of a spring and move the other end from side to side, each part of the spring moves from side to side a little bit after the part before it. water waves are transverse.

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## Longitudinal waves

if you fix one end of a spring and move the other end backwards and forwards, each part of the spring moves backwards and forwards a little bit after the part before. sound waves are longitudinal.

longitudinal waves are often drawn as fronts

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## Describing Waves

the frequency is the amount of waves that pass in a second - measured in Hertz (Hz) the wave speed is how fast the wave travels (m/s)

wave speed (v (velocity)) = frequency (f) x wavelength (λ (lambda))

m/s                                      Hz                       m

frequency = 1/time period

the amplitude of a wave is its maximum disturbance from the middle of the wave.

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## Reflection and Refraction

when a water wave hits a straight barrier, it follows the same rule as reflecting light.

the speed of a wave is effected by the depth of the water, when the water is shallower, the waves act in the same way as when light travels through a glass block. this is called refraction

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## Diffraction

when water passes through a narrow gap, they tend to spreat out from the edges.

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