## DeBroglie Equation Post Assessment

$\lambda=\frac{h}{p}$

gabbym
Posts: 76
Joined: Wed Apr 11, 2018 3:00 am

### DeBroglie Equation Post Assessment

At what velocity is an electron moving if it has a de Broglie wavelength of 7.0 × 10-11 m? Can someone help me with this problem?

A De Castro 14B 2H
Posts: 75
Joined: Fri Sep 28, 2018 12:29 am

### Re: DeBroglie Equation Post Assessment

With this problem, use the deBroglie Equation: λ = h/p, where p is momentum = masselectron * velocity. You can rearrange the equation to calculate the velocity: v = h/(λ * masselectron)

Samantha Man 1L
Posts: 63
Joined: Fri Sep 28, 2018 12:22 am

### Re: DeBroglie Equation Post Assessment

By plugging in your given wavelength, the mass of an electron (9.11E-31kg), and Planck's constant, you can solve for the velocity.

Jonas Talandis
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

### Re: DeBroglie Equation Post Assessment

Hi,

Using the De Broglie equation (Wavelength = h/m*v), we can insert the given wavelength, the Planck constant, and the known mass of an electron, which is given on the test btw, to solve for v. Hope that helps.