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## Homework Statement

What is the speed of impact of electrons with the screen of the picture tube? Answer in units of m/s.

Electrons are accelerated through a potential difference of 15500 V

Charge of electron: 1.6 x 10^-19 C

Mass of electron: 9.11 x 10^-31 kg

Energy of electrons when they hit the screen: 2.48E-15 J

## Homework Equations

v=Ed

f=ma

f=qE

K = .5mv^2

## The Attempt at a Solution

I tried using that equation, I made it 15500 = .5mv^2 ... obviously plugging in the above numbers for m and v.

Computer said the answer was wrong.