Quantum Made Simple - The Double Slit Experiment

[WillB1898]

Hi everyone, as part of a series on making accessible Quantum Mechanics I covered the famous Double Slit experiment, and how “observation” changes the physical behaviour of fundamental particles. It's my all-time favourite experiment in quantum physics, hope it’s of interest!

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[swansont]

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[Genady]

3 hours ago, WillB1898 said:

... how “observation” changes the physical behaviour of fundamental particles. 

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Observations do not change the physical behavior of particles. They behave just the way they behave.

[StringJunky]

2 hours ago, Genady said:

Observations do not change the physical behavior of particles. They behave just the way they behave.

If you use photons to observe some particle, may they  not change said particle's energy?

[Genady]

2 hours ago, StringJunky said:

If you use photons to observe some particle, may they  not change said particle's energy?

Sure. The photons would change the particle's momentum, but not the observation. They would do so also if not observed.