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.

(http://t2.gstatic.com/images?q=tbn:ANd9GcSqiQNNaqrO3l55e7de7YiLGqNkzZHxOk82bRLQIM3zcF_eI10WxA)

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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.

(http://t1.gstatic.com/images?q=tbn:ANd9GcQtP67tO_uXPl-v_1Ggd6OkkEE4TDUgnI2P7McifxUz2GWsE1Kgsg)

longitudinal waves are often drawn as fronts

(http://t2.gstatic.com/images?q=tbn:ANd9GcTCqxFyPZFDm9_r3E_emLI0XIVzh-WMX2EWetspdrwlaOBXEahCs2HNxL3K)(http://www.phulson.ca/imag/sound.gif)

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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.

(http://t1.gstatic.com/images?q=tbn:ANd9GcT2YPkI-0krP9S2q3tZD8DCrYtj0cfPsD2ph5GUUOXZBURSqoaUPA)

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

(http://t3.gstatic.com/images?q=tbn:ANd9GcSYGlemSQe00sZWxxTjMza9YFl3g9GFnK6_qHfxZh3UjYRI0a1cZQ)

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Diffraction

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

(http://t0.gstatic.com/images?q=tbn:ANd9GcTaWap8rGElA2PjPMZbOVWn1hSIsMr1P9xXI9tLPdyokbz9KuZ9)

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