ANSWERS: 3
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The length of a soundwave at 20Hz is 56.26 ft. The length of a soundwave at 20Khz is 0.67 inch. Source - frequency to wavelength converter: http://www.sengpielaudio.com/calculator-wavelength.htm
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What's the speed of sound in air? What's the frequency of the sound in question? How do I determine the wavelength of said sound travelling through said medium? It's right there in your text book.
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sound travels at 380m/s or 1050ft/s in air. The general expression is c = fw where c is the speed of sound, f is the frequency and w is the wavelength.
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