# Homework Help: Formula for electron accelerated across potential difference?

1. May 14, 2006

### juliab

I got this homework and I don't know what formula to use on these problems:

An electron is accelerated across a potential difference of 54V. (a) Find the maximum velocity of the electron. (b) Calculate the deBroglie wavelength of the electron.

2. May 14, 2006

### Astronuc

Staff Emeritus
1 electron accelerates to 1 eV of energy across a potential difference of 1 V = 1 J/C.

The energy obtained with 54 V would be all kinetic energy since the velocity/energy is non-relativisitic.

3. May 14, 2006

### juliab

2 follow-up questions:

How to convert volts into electrovolts?
What's the mass of an electron?

4. May 14, 2006

### Curious3141

The question should be how to convert eV to joules? Both this question and the mass of the electron are easily answered with google. You can just type "eV in joules" into the google bar and get google calculator to tell you the answer. Then type "mass of electron".