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A classic double slit experiment is done with electrons emitted toward two slits followed by an image screen. An interference pattern is seen on the screen. Now the electron source is slowed to emit a single electron at a time, so that only a single electron goes through the experiment at a time. What pattern appears on the image screen?

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The classic experiment was performed with photons and a month-long exposure while the student went on a sailing holiday.

great reason to take a holiday!
see you on the other side -