78. The pressure of a dilute gas in the x-ray tube at 17 °C is equal to 130 uPa. Is it possible to talk about a high vacuum if the characteristic size l0 (the distance between the anode and cathode tube) is 50 mm? The effective diameter of air molecules is assumed to be 0.27 nm.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)