Just a quick question (or few).
It’s in regard to the experiment described in 3.2.2 where the distribution of molecular velocities is measured using a box of gas with a pinhole, a series of rotating discs and a detector.
It says that only molecules with the selected speed can pass through to the detector. What happens to the molecules that escape through the pinhole but aren’t at the selected speed? Do they bounce straight back into the box?
I would assume that in order for this to happen the pinhole would have to be small enough so that the molecules passed through at an orientation perpendicular to the discs. But wouldn’t that restrict the ‘randomness’ of the experiment? Or do they hold the experiment over such a large time to accommodate this?
Alternatively are the molecules just lost into the vacuum if they are not at the correct velocity? And if this does happen wouldn’t that also skew the obtained results?
I must be missing something.