If you multiply the wavelength (in meters) and the frequency (in Hertz), you will get the speed of the wave (in meters per second).
The speed of any wave is the product of wavelength x frequency. In this case, because of the units chosen (meters, and hertz, which is equal to 1/second), the speed will come out in meters/second.
The equation to use in this case is:speed (of the wave) = wavelength x frequency If the frequency is in hertz, and the wavelength is in meters, the speed will be in meters/second.
Wavelength = speed/frequency = 30/10 = 3 meters
Convert that to meters. Then divide the speed of light (in meters/second) by the wavelength. The answer will be in hertz.
Wavelength = (speed) / (frequency) = 20/4 = 5 meters.
Wavelength is in meters, the frequency is in hertz. period is in seconds and the wave speed is in meters per second.
(4 meters) x (3 per second) = 12 meters per second
Just divide the speed of light (in meters/second) by the frequency (in hertz) - that will give you the wavelength (in meters). You can then convert that to nm.
Hertz is a measurement of wavelength. It is the number of cycles in a second. You can also measure wavelength by the length of the wave moving at the speed of light. 3.5 MHZ (Mega Hertz) is about 80 meters long.
Divide the speed of light (in meters/second) by the wavelength (in meters). The answer is in Hz (1/second). Divide that answer by a million to get MHz.
You get a speed. If the 'Hertz' is the frequency of a particular wave, and the 'meters' is the wavelength of the same wave, then their product is the speed of that wave.