Question

Middle C on a piano has a frequency of 256 Hz. If the speed of sound in air is 343 m/s, what is the wave’s period?

Answer 1

We can find the period of the wave from the formula:

$$f=\dfrac{1}{T},$$ $$T=\dfrac{1}{f}=\dfrac{1}{256\ Hz}=3.9\cdot10^{-3}\ s.$$

Answer:

$T=3.9\cdot10^{-3}\ s.$