What is the speed of a sound wave whose frequency is 2000 Hz and whose wavelength is 0.2 m?
$$ frequency = \frac{speed of the sound wave}{wavelength} $$
given
frequency = 2000 Hz
wavelength = 0.2 m
substituting
$$ 2000 =\frac{c}{0.2} $$
solving
speed of a sound wave = 400 m/s
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