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B What is the amplitude of light?

  1. Feb 25, 2017 #1
    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:
  2. jcsd
  3. Feb 25, 2017 #2
    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
  4. Feb 25, 2017 #3
    Thanks, vishal giri. I asked for the amplitude, though. The frequency is clear anyway...
  5. Feb 25, 2017 #4


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    Staff: Mentor

    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.
  6. Feb 26, 2017 #5
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