In the standard double-slit experiment with single electrons, the distance at which the electrons are shot and the distance between the "gun" and the screen detecting the interference pattern can vary depending on the specific experimental setup. However, I can provide you with a typical setup and distance ranges used in such experiments.
In these experiments, a source of electrons, such as an electron gun or a material that emits electrons, is used to generate a beam of electrons. The electrons are then directed towards a barrier containing two narrow slits, often referred to as the double slit. The distance between the two slits is typically on the order of micrometers or nanometers.
The screen where the interference pattern is detected is placed at a certain distance away from the double slit. This distance can vary, but it is usually in the range of a few centimeters to a few meters. The specific distance depends on factors such as the desired size and resolution of the interference pattern.
It is worth noting that in experiments with electrons, the distances involved are typically much smaller compared to experiments with light. This is because the de Broglie wavelength associated with electrons is much smaller than the wavelength of visible light. As a result, the interference patterns observed in electron double-slit experiments are typically on a smaller scale.
It's important to emphasize that the exact experimental setup and distances can vary depending on the specific goals and constraints of the experiment. Different setups may be used to study various aspects of quantum mechanics and wave-particle duality.