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A comment on Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen resolution. Parent comment

Re:Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen r... by sowbug on Thursday November 28, 2019 @12:21PM (#21658867)
Microwave ovens and wifi use the same frequency range for the same reason: 2.4 GHz is available as unlicensed spectrum. In theory someone could build a 5 GHz microwave oven, but it wouldn't be cost-effective for a consumer appliance.

I once heard something about that frequency working better with water molecules, but after looking it up I think it's a myth.

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Re:Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen r... by pvg on Thursday November 28, 2019 @02:31PM (#21659640)
A 5 GHz microwave would be more efficient but you don't necessarily want more efficient for cooking - that would just heat the outside of the food fastest. Commercial microwaves apparently run somewhere in the 900 MHz band. There are some neat graphs here:

http://www1.lsbu.ac.uk/water/microwave_water.html

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