(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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

2. Relevant equations

v=Ed

f=ma

f=qE

K = .5mv^2

3. 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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Speed of Impact of electrons in a television.

**Physics Forums | Science Articles, Homework Help, Discussion**