B What is the amplitude of light?

Like every wave, light has a frequency and an amplitude. So far, I know that the frequency equals to the photon energy and the amplitude to the amount of photons. My question is: how big is that amplitude and does it matter?
Thanks for every reply :wink:
 
frequency of the light can can be described as hν=E, SO FREQUENCY=E/h where h is joule s constant if we knw the photon energy
 
Thanks, vishal giri. I asked for the amplitude, though. The frequency is clear anyway...
 
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You can look at the strength of electric and magnetic fields. As an example, an intensity of 1 kW/m2 for a planar wave corresponds to peak values of about 400 V/m and 1.4 microTesla, give or take numerical prefactors that I forgot.
 

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