In the double-slit experiment with single atoms or molecules, the distance at which the atoms or molecules are shot can vary depending on the specific experimental setup and the goals of the experiment.
In general, the distance at which the atoms or molecules are launched can be adjusted to achieve the desired experimental conditions. The atoms or molecules are typically accelerated or manipulated using electromagnetic fields, such as lasers or electric fields, to control their motion and direct them towards the double-slit apparatus.
The distance at which the atoms or molecules are launched can range from a few centimeters to several meters, depending on the experimental design. It is important to ensure that the atoms or molecules have sufficient kinetic energy to traverse the distance between the launching point and the double-slit, and to maintain their coherence and quantum properties during the journey.
The choice of launching distance is often determined by various factors, including the desired level of coherence, the size and separation of the double-slit, and the characteristics of the atom or molecule being studied. Different experiments may require different launching distances to achieve the desired experimental conditions and results.
It's worth noting that in such experiments, the atoms or molecules are typically launched in a vacuum to minimize interactions with the surrounding environment, such as air molecules, which could disrupt their quantum behavior.
Overall, the specific distance at which atoms or molecules are shot in a double-slit experiment can vary, and it is determined based on experimental considerations and the goals of the study.