The product of (wavelength) times (frequency) is the speed.
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When working with waves ... or even just talking about them ... (frequency) = (speed) divided by (wavelength) (wavelength) = (speed) divided by (frequency) (frequency) times (wavelength) = (speed)
Whatever the wavelength and frequency happen to be, their product is always equal to the speed.
Speed of wave (e.g. m/s) = wavelength (m) x number of waves per second (Hz) So you can figure out any one of speed, wavelength or frequency if you know the other two. Often, you know the speed (e.g. light, 3x10^8 m/s, or sound, 340 m/s).
Wavelength x frequency = speed of the wave, so wavelength = speed / frequency. In SI units, wavelength (in meters) = speed (in meters/second) / frequency (in Hertz). If you are talking about electromagnetic waves in avacuum, use 300,000,000 m/s for the speed.
That depends, what wave you are talking about. The general relationship is: speed (of the wave) = frequency x wavelength. Solving for frequency: frequency = speed / wavelength If you are talking about an electromagnetic wave in a vacuum, the speed is about 300,000,000 meters/second. Other waves, however, can have quite different speeds.