Question

An electron in a tv picture tube is accelerated through a potential difference of 10 kv before it hits the screen. What is the kinetic energy of the electron in electron volts?

Answer 1

10,000 eV

Step-by-step explanation:

Due to the law of conservation of energy, the kinetic energy of the electron at the end of its path is equal to its initial electric potential energy, given by:

`U=q\Delta V`

where

q is the electron charge

`\Delta V` is the potential difference

Here we have:

`q=1 e` is the electron's charged

`\Delta V=10 kV=10,000 V` is the potential difference

Substituting into the formula, we have

`U=(1e)(10,000 V)=10,000 eV`