Electromagnetic or EM waves travels with light speed and the speed of light is 299792458 msec. In the electromagnetic spectrum there are many different types of waves with varying frequencies and wavelengths. So we can write the above equation as.
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The above equation is used to discover the frequency or wavelength of the EM wave by dividing the measurement with the light speed to get another measurement. This frequency is then 5451 E14 hertz. The equation that relates wavelength and frequency for electromagnetic waves is. What is the frequency of green light which has a wavelength of eq490 times 10-7 eq m.