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Waves - Coggle Diagram
Waves
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oscilloscopes
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When a microphone is connected to an oscilloscope, the (longitudinal) sound wave is displayed as though it were a transverse wave on the screen
The height of the wave (measured from the centre of the screen) is related to the amplitude of the sound
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doppler effect
if wave is moving towards to observer the wavelength appears shorter so frequency appears higher. The wave speed is constant. this is the opposite when the wave is moving away
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internal reflection uses
optical fibres used for communication and work due to different densities of glass meaning light travels at different speeds.
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speed of sound practical
to measure the speed of sound in air, you can make a noise at a known, large distance from a solid wall and record the time taken for the echo to be heard and then use distance = speed / time
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