How to find the period of a wave

The method to choose depends on what information you have, and

on what you can measure. Here are a few possible methods:

- - Measure the period. Start your clock when one peak

of the wave passes you. Stop the clock when the next

peak passes you. The time between the two peaks is

the wave's period.

- - Divide the wave's wavelength by its speed. That quotient

is the wave's period.

- - Use an electronic frequency meter to measure the wave's

frequency. Then take its reciprocal (divide ' 1 ' by it). The

result is the wave's period.