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- Thread starter IMGOOD
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Amplitude squared for almost all physical waves- water, pressure, electromagnetic etc.

For photons however, which are massless particles, the energy is proportional to the frequency, with the proportionality constant h (planck's constant)

E=h freq

You have to be Einstein to discover things like that- and in fact he did. He deduced the above relation from the 'photo-electric effect'.

It's completely counterintuitive that frequency should have anything to do with the energy of the wave, but that's what quantum-mechanics gives.

Edit: And even more weird: The amplitude squared for photon quantum waves is the probability that the photon is found in that place when a measurement is made.

Nobody understands that one- but it seems to be how the universe works.

For photons however, which are massless particles, the energy is proportional to the frequency, with the proportionality constant h (planck's constant)

E=h freq

You have to be Einstein to discover things like that- and in fact he did. He deduced the above relation from the 'photo-electric effect'.

It's completely counterintuitive that frequency should have anything to do with the energy of the wave, but that's what quantum-mechanics gives.

Edit: And even more weird: The amplitude squared for photon quantum waves is the probability that the photon is found in that place when a measurement is made.

Nobody understands that one- but it seems to be how the universe works.

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I see. That makes a lot of sense and it is a pretty nice way to look at the relationship between photons and EM waves. Thanks!

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For water waves the dependence is more complex, but is some cases it is also proportional to the squared amplitude and squared frequency.

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