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?

10,000 eV

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:

where

q is the electron charge

is the potential difference

Here we have:

is the electron's charged

is the potential difference

Substituting into the formula, we have

b. a lightning bug, plug of grass, and a worm