Question

How much time is required to move the electron beam from end of last line to the start of the next line ​

Answer 1

Answer:

Explanation:

Given A beam of electrons moving at a speed of 10^6 m/s along a line produces a current of 1.6x10^-6 A. The number of electrons in the 1 metre of the beam is:

We know that I = q/t

Or time = distance / speed

So t = s/v

Now I = qv / s

Also q = ne

I = nev / s  

Or n = I s / ev

Now n = 1.6 x 10^-6 x 1 / 1.6 x 10^-19 x 10^6

So n = 10^-12 + 19

Now n = 10^7