How do we measure frequency of electromagnetic wave?
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Answer:The Frequency of an EM wave is measure in exactly the same way as the frequency of say a sound wave or an set of ocean wave.
It is measured in Hz (Hertz) which is literally a count per second: Given a traveling wave how many waves pass a given fixed point in one second.
As you know velocity, frequency and wavelength are inter-related :
v=f∗λ
v = velocity of the wave
f= frequency in Hz
λ = Wavelength
For an EM wave in a vacuum, v = c (299792458ms)
Frequency changes across the EM spectrum
Gamma Rays : > 3∗1019 Hz
X Rays : 3∗1016 Hz to 3∗1019 Hz
Ultraviolet : 8∗1014 Hz to 3∗1016 Hz
Visible :8∗1014 Hz to 4∗1014 Hz
Infra Red : 3∗1011 Hz to 4∗1014 Hz
Microwaves : 3∗109 Hz to 3∗1011 Hz
Radio : 30 Hz to 3∗109 Hz
Explanation:
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