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13 cards from this deck
~50m
Make noise ~50m from wall, time echo, speed = distance/time
2 microphones at large distance, time difference, speed = distance/time
Same frequency as the water waves
Distance between 'fixed' ripples
v=fλv = f \lambdav=fλ
Wave speed
Frequency
Wavelength
Metres per second (m/s)
Hertz (Hz)
Metres (m)
Move pencil at wavefront speed, time it, speed = distance/time
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