How to solve my physics question?

Posted on 2014-12-12 06:37:00 in Physics by JASON

A) At 20°C, what is the frequency of a sound wave in air with a wavelength of 21 cm?
Answer in Hz Please.

(b) What is the frequency of an electromagnetic wave with a wavelength of 21 cm?
Answer in GHz Please.

(c) What would be the wavelength of a sound wave in water that has the same frequency as the electromagnetic wave of part (b)?
Answer in nm Please.

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