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Engineering question: How does the electron gun shoot one electron at a time to the double slit target? How was this possible when the experiment was done 100 years ago? How is this done with photons? Is there a check to ensure only one electron/photon is arriving at the target?

Al Germain
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In practice, you set the intensity of the source to a level at which it is unlikely that there is more than one electron or photon in the apparatus at a time. It doesn't have to be perfect.

John Doty
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