How to Calculate Wavelength With a Formula

By Society & Culture & Entertainment Last updated Sunday, April/14/2024

1). Measure the speed of the wave. For electromagnetic waves such as light and radio waves, the speed is the speed of light defined at 299,792,458 meters per second. For mechanical waves such as sound and ocean waves, the speed of the wave is much less and must be determined.
2). Divide the speed of the wave by the frequency to calculate the wavelength (wavelength = wave speed ÷ frequency). For example, a radiowave with a frequency of 90 MHz (MHz means megahertz with one megahertz equaling one million waves per second) has a wavelength of 3.33 m. This is determined by dividing the frequency (90,000,000 waves per second) by the speed which in this case is the speed of light (299,792,458 m per second) to yield 3.33 m (299,792,458 m per second ÷ 90,000,000 waves per second = 3.33 m).
3). Practice this equation on different speeds.

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