In a particular television tube, the beam current is 50.0 micro A. How long does it take for 4.75 * 10^14 electrons to strike the screen?

1 Answer
Jun 18, 2016

It takes 1.52"s".

Explanation:

The definition of Ampère is

1"A"=1"C"/"s"

we have 50\mu "A"=50*10^-6"C"/"s".

We have to know how many Coulombs of charge do we have in 4.75*10^14 electrons.

The charge of an electron is 1.6*10^(-19)"C", then our beam has

4.75*10^14*1.6*10^(-19)"C"=7.6*10^-5"C".

The time to transport 7.6*10^-5"C" in a current of 50\mu"A" is then

t=(7.6*10^-5"C")/(50*10^-6"C"/"s")=1.52"s".