Wavelength times frequency gives the speed of the wave.
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The product of its wavelength multiplied by its frequency is always equal to its speed. I think that's true even if the speed is not constant.
The frequency of a radio wave in Hertz (cycles per second) multiplied by the wavelength of the radio signal (in meters) is always equal to the speed of light, which is equal to The speed of light has the symbol "c". So Frequency/c = wavelength, and wavelength/c = frequency. == ==
Wavelength = (speed) divided by (frequency) Frequency = (speed) divided by (wavelength) Speed = (frequency) times (wavelength)
It looks a little like V = f x λ, which to me means velocity = frequency multiplied by wavelength. For example, with sound, you could have a frequency of 100Hz and a wavelength of 3.4m giving a velocity of 340m/s. Alternatively you could rearrange the equation if the velocity is know but the frequency or wavelength isn't
Frequency = (speed) / (wavelength)