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P12 Wave Properties (The Nature of Waves (Ripples on the surface of water…
P12 Wave Properties
The Nature of Waves
Ripples on the surface of water are transverse waves, so are all electromagnetic waves
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Mechanical waves need a medium to travel through, they can be transverse or longitudinal
Seismic Waves
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The earth has a solid inner core surrounded by a liquid outer core, which is surrounded by the Earth's mantle
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The Properties of Waves
For any wave its wavelength is the distance from a point on the wave to the equivalent point on the next wave
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For any wave, its frequency is the number of waves passing a point per second
For any wave, its amplitude is the maximum displacement of a point on the wave from its undisturbed position, such as the height of the wave crest from the position at rest
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Sound Waves
Sound waves cause the ear drum to vibrate, and the vibrations send signals to the brain
The conversion of sound waves to vibrations of solids only works over a limited frequency range, so human hearing is limited
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The Uses of Ultrasound
Ultrasound waves reflected at boundaries are timed, and the timings are used to calculate distances
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