Question

a tv set picture tube emit a beam of electrons. the current due to beam is 10 mA. how many electrons strike the tv screen every second

Answer 1

10mA
=0.001A

I=q/t
q=0.001

q=ne
0.001/1.6*10^-19


2.25*10^21 electrons

Answer 2

There are $6.25\times 10^{16}$ electrons strike the tv screen every second.

Explanation:

The current due to beam of electrons, $I=10\ mA=10\times 10^{-3}\ A$

It is required to find the number of electrons strike the tv screen every second.  We know that the electric current is defined as the rate of change of electric charge. It is given by :

$\dfrac{q}{t}=I$

But q = ne

n is no of electrons

$ne=It\\\\n=\dfrac{It}{e}\\\\n=\dfrac{10^{-2}\times 1}{1.6\times 10^{-19}}\\\\n=6.25\times 10^{16}$

So, there are $6.25\times 10^{16}$ electrons strike the tv screen every second.

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Electric current

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