SPHR 2107 Lecture Notes - Lecture 3: University Of Manchester, Damping Ratio, Inverse-Square Law
4 Jan 2018
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You have a sine wave whose period is 6 msec. (what"s a msec???) What is the wavelength of the signal? (assuming the velocity of sound in air is 1100 ft. /sec. = c/f (where c = 1100 ft/sec ( we will assume that this is the speed. Definition: the distance in a medium between a region of compression and the next region of compression. of sound in air at room temperature in this class) If you know t or f, you can calculate wavelength. = c / f (thinking in terms of units): Wavelength units are ft/cycle, but more commonly, feet. What is the wavelength of a 2000 hz ft/cycle = ft/sec ft = ft x sec cycle sec cycle (cancel terms) cycle/sec: . 55 hz, . 55 feet, 200 feet, 200 hz. What is the wavelength for a signal whose period is 20 msec. = 1100 ft/sec x . 020 sec/cycle: 55 feet, 22,000 feet, 2200 feet, 22 feet.
