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Physics Forums's title: Physics Forums | Science Articles, Homework Help, Discussion

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What really is dark matter and dark energy?
Given that Dark Matter and Dark Energy are estimated to account for roughly 95% of the universe's total mass-energy content, the fundamental nature of these phenomena remains a critical question in modern cosmology.

Currently, the standard Lambda-CDM model treats them as distinct, physical...


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Electric kettle repair, incorrect temp sensor readout
greetings

I've got a Chefman branded electric kettle (Chefman-Rj11-17) that went haywire -
the kettle can be turned on normally, and the small LED on the handle displays water temperature, however, during the heating process, the temp displayed jumps to 212F rapidly, and the kettle turned off...


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Resolution of the Frauchiger-Renner paradox
Brilliant paper https://arxiv.org/abs/2202.04203v2 recently published in Nature Communications (open access) https://www.nature.com/articles/s41467-024-47170-2 resolves and demyst...

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Double slit experiment - sensor interacts with photons?
sensor in slit must interact with photon, so isn't sensor reason why patterns on screen change?
So what is exactly weird in this experiment?

Can we somehow observe photon in slit but do not physically interact with him?

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Harmonic Orders
I'm looking for a mathematical representation of a fundamental wave and it's harmonic modes.
For example a wave of 590 nm what are its 'octaves'?

Can the resulting formula be represented in polar coordinate 'vector' space?

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