Saved Bookmarks
| 1. |
A beam of fast moving electrons having cross-sectional area A falls normally on a flat surface. The electrons are absorbed by the surface and the average pressure exerted by the electronson this surface is found to be P. If the electrons are moving with a speed v, then the effective current through any cross-section of the electron beam is |
|
Answer» Ape/(mv) (NAV)(mv)=F,`P=F/A ` `rArr n=P//(mv^(2))` `:. i=nAve=(Ape)/(mv)` |
|