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Double-slit (lemmy.ml)

submitted 1 year ago by [email protected] to c/[email protected]

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[–] [email protected] 33 points 1 year ago* (last edited 1 year ago) (12 children)

The double slit experiment demonstrates the wave-particle duality of light.

You shoot photons at a barrier that has two slits in it. The pattern on the backstop appears as in the top right panel: an interference pattern, because light is behaving as a wave.

Next, you set up a detector at the slits, so that you can determine which slit each photon passed through, one photon at a time. Now the pattern on the backstop appears as the lower right panel, not an interference pattern, because each photon is acting as a particle.

Not looking: wave. Looking: particle.

[–] [email protected] 1 points 1 year ago (3 children)

What if u look at only one of the slits?

[–] Gabu 3 points 1 year ago (2 children)

Same deal, you're still measuring and can still determine which photons passed through which slit.

[–] fruitSnackSupreme 2 points 1 year ago (1 children)

But then you potentially wouldn't be interacting with all the photons right?

[–] Gabu 1 points 1 year ago

You are, just not in an intuitive way. Because you'd know the rate of emission of your light source, the information of when a photon passes slit-2 would still "tag" them (whatever photon didn't pass slit-1 must have passed slit-2).

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