Water waves

Reflection

Complete this diagram of plane waves reflected at a barrier

Refraction

Refraction

These waves move suddenly from deep to shallow water. Complete by drawing the waves in the shallow water.

3 Wavelength gets shorter; amplitude unchanged .

Interference

Interference

Crest added to a crest gives a higher crest . Crest added to a trough gives cancellation Constructive interference Destructive interference

Interference http://www.ngsir.netfirms.com/englishhtm/Interference.htm

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Diffraction http://www.ngsir.netfirms.com/englishhtm/Diffraction.htm http://www.ngsir.netfirms.com/englishhtm/Diffraction2.htm http://www.ngsir.netfirms.com/englishhtm/Diffraction3.htm

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The wavelength of water waves may be several metres. If the wavelength is of a similar size to a gap in a harbour wall, then the wave will diffract as shown below

If the wavelength does not match the size of the gap, then only a little diffraction will occur at the edge of the wave.

This harbour has a narrow entrance. Draw the waves that enter the harbour

The worm in the figure is moving to the right. The wave pattern, a pulse consisting of a compressed area of its body, moves to the left. In other words, the motion of the wave pattern is in the opposite direction compared to the motion of the medium