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> just here to observe single photons weren't reliably emitted until the modern era.

A dim light bulb from a few feet away emits on the order of 1k photons/sec, which is low enough that you can count individual emissions using fairly simple analog equipment [0] [1].

> The double slit experiment pre-dates this. it's from 1801. The one which confirms "self interaction" was 1974.

There's an experiment from 1909 that demonstrated the double-slit experiment with single(ish) photons [2].

> I only observe it's mostly for young students (like almost all received wisdom) grounded in experiments which don't actually do what people think they do. The ones you run in the school lab are illustrative not probative.

> What people do in places like the BIPM in Paris, or CERN, isn't the same as that experiment you did with a ticker-tape and a weighted trolleycar down a ramp. "it's been confirmed" is the unfortunate reality of received wisdom, and inherently depends on trust in science. I do trust science.

The double-slit experiment is actually fairly easy and cheap to run [3]. Certainly more complicated than ticker tape, but not by much.

[0]: https://en.wikipedia.org/wiki/Scintillation_counter

[1]: https://en.wikipedia.org/wiki/Photomultiplier_tube

[2]: https://www.biodiversitylibrary.org/page/31034247

[3]: https://www.teachspin.com/two-slit



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