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So the wave moves like. a wave, it moves up and down, up and down. But how do photons move? Do they follow the same path or do they just go straight forward without oscillating?

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Lubos in his blog has an article on how the classical electromagnetic wave is built up by photons.motls.blogspot.gr/2011/11/… . simple , it ain't. –  anna v Jan 31 '13 at 16:10
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To speak simply of the classic diagram of a wavy line travelling left to right, the wavy line represents the strength and direction of the electric field vector. The path of the wave may be considered to travel along the zero point on this axis. –  Nic Jan 31 '13 at 16:25
    
@Nic, since Brazz answered pretty the same, I commented his post, could you take a look? –  ctapobep Feb 1 '13 at 14:34

1 Answer 1

The question is a bit tricky. Actually, a photon is the electromagnetic wave. Photons are quanta of the field. You can imagine a photon as the fact that there is an oscillation in the field.

However, if you are in an approximation that allows you to treat photons as particles, then I would say that the don't oscillate, they just move on at light speed.

I know, the answer is not complete, I should explain better how photons can be defined, but perhaps someone can do it better than me.

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How do they pass over other small particles then if they don't oscillate themselves? Like light wave can jump over some obstacle which looks impossible if photon just goes straight.. –  ctapobep Feb 1 '13 at 14:32
    
Two possible answers: they are particles, they don't pass over other particles, they strike them; or: they are waves, so they can diffract around. Notice that the same holds for electrons: it's wave-particle duality. –  Bzazz Feb 1 '13 at 15:00
    
Found this on why light goes through things like glass: youtube.com/watch?feature=endscreen&NR=1&v=Omr0JNyDBI0 –  ctapobep Feb 13 '13 at 16:15

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