1. The problem statement, all variables and given/known data The beam of electrons in a cathode ray tube contains electrons travelling at 8.4x106 ms-1 and the current throgh the tube is 2.8 micro A. a) how many electrons are emitted per second from the cathode of the tube b) what is the number of electrons per unit length of the beam? 2. Relevant equations I=nAvq q=16.x10-19 there are more equations involved in the proof of I=nAvq which might be needed 3. The attempt at a solution possibly involves Q=nAvte ?