Wavelength
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Measure the length between two crests or two troughs.
Wavelength is the distance between two successive crests or troughs in a wave. And time period is the time taken for the disturbance to move from one crest to the successive one. So wavelength/ wave period (time period) = speed of the wave.
The golden ratio is the ideal ratio because it is consistent throughout many aspects in nature - proportions of the human body, the crests and troughs of a heartbeat, the stripes on a tiger's head, et cetera. The value of the Golden Ratio is 0.5*[1 + sqrt(5)] = 1.61803 (to 5 dp)
frequency
20 waves per minute. (or 1 every 3 seconds)