# Homework Help: Wavelength of an electron

1. Sep 23, 2013

1. The problem statement, all variables and given/known data
What is the corresponding wavelength, in meters, of an electron moving at 1 m/s?
Velocity: 1 m/s
Planks Constant = 6.626 069 57 x 10^-34
Mass of electron = 9.109 382 91 x 10^-31
Momentum = unknown
2. Relevant equations
We need to find momentum to use De Broglie's equation.

Momentum = Mass * Velocity
De Broglie's Equation for finding the wavelength: λ = h/p
h being the planck constant

3. The attempt at a solution

My attempt.

Finding momentum : P = 9.109 382 91 x 10^-31 * 1 m/s
p = 9.109 382 91 x 10^-31
finding the wavelength
First divide the numbers WITHOUT the exponent
so 6.626 069 57/9.109 382 91 = 0.727 389 51
now exponents -34/-31
= -3 (I took out the extra steps)

final answer λ = 0.727 389 51 x 10^-3

is this correct?

Last edited: Sep 23, 2013
2. Sep 23, 2013

### rude man

No.
How did you get from 0.727 389 51 to .0727 389 51 ?

3. Sep 23, 2013

Oh crap ! MY bad human error it is a typo!

Last edited: Sep 23, 2013
4. Sep 23, 2013

### rude man

Thought so! But instructors mark off for those too!

5. Sep 23, 2013