Asked by Frank

What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?
Answered by Damon
distance = speed time time
so
wavelength = speed of sound * period T
but
f = 1/T
so
wavelength = speed of sound / f

f = speed /wavelength
look up speed of sound at 20 C in your book (different tables available)
Answered by Frank
857.5hz?
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