Question

shoots a
An electron gun in a Tv Set
beam of electrons. The beam current is
4.8 u A. How
many
electron Strike the
TV/
second​

Answer 1

Given

$I$ = Beam current = $4.8\ \mu\text{A}$

To find

Number of electrons striking per second

Solution

q = Charge of an electron = $1.6\times 10^{-19}\ \text{C}$

n = Number of electrons

t = Time taken

Current is given by

$I=\dfrac{nq}{t}\\\Rightarrow \dfrac{n}{t}=\dfrac{I}{q}\\\Rightarrow \dfrac{n}{t}=\dfrac{4.8\times 10^{-6}}{1.6\times 10^{-16}}\\\Rightarrow \dfrac{n}{t}=3\times 10^{10}\ \text{electrons/second}$

The number of electrons striking per second is $3\times 10^{10}$.