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? (1 ev = 1.6 ? 10 -19 j)

10,000 eV

Explanation:

According to the law of conservation of energy, the kinetic energy gained by the electron is equal to its change in electric potential energy:

where:

K is the kinetic energy of the electron

is the magnitude of the charge of the electron

is the potential difference through which the electron has been accelerated

For this electron in the TV, we have

Therefore, the kinetic energy of the electron in electronvolts is