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The wave equation
This video begins with the mnemonics Very furry lambs and Cute furry lambs.
Using a model of a railway carriage (its length, x and time taken to travel, t) the equation for velocity (v = x/t) is derived. Equating the length of the carriage to wavelength, λ and time to the period, T the equation v = λ/T is derived. As 1/T is the frequency, f of a wave, the wave equation v = f λ is derived (Very furry lambs). If the velocity of a wave is known with some certainty, e.g., the speed of light in a vacuum, v is substituted with c (Cute furry lambs), i.e., c = f λ.
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