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How Is Wave Speed Calculated?

In physics, a wave is a disturbance or variation that travels through a medium. As a wave travels, it transports energy progressively from one location to another. Wave speed of sound, light or electromagnetic signals is a property of the medium; you can calculate it using the general wave equation. For a given medium, which does not change as the wave travels, wave speed is a constant. You can find the calculation of wave speed in several fields, including sub-seafloor imaging and telecommunications.

  1. Define the Parameters You Will Need

    • The equation you will use states that wave speed (c) in meters per second equals wavelength (l) in meters multiplied by frequency (f) in hertz. Therefore, you will need two parameters: l and f.

    Simplify the Calculation

    • If you have a value for periodic time (T) in seconds, calculate 1 divided by T with a calculator to obtain f.

    Perform the Calculation

    • Calculate l multiplied by f with a calculator to obtain c.

    Include the Derived Units

    • Add the derived units of wave speed, meters per second, to the calculated value. A combination of your calculated value and the units is your wave speed.

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