If the sound waves produced by this string have a wavelength in air of 1.30m, what is the speed of sound in air?
The string of a piano that produces a middle "C" note vibrates with a frequency of 2.64x10(square root of 2)Hz
The way that you typed the question has probably thrown everyone off. Middle C would be 264 Hz which can be written as 2.64 * 10². that is 'squared'; not 'square root'.
velocity = frequency * wavelength
= 264 * 1.30
= 343.2 metres per second.
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