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

Find the de Broglie wavelength of a 7.0 eV electron.

2. Relevant equations

de Broglie wavelength = h/p = h/(mv)

Photoelectric effect equation (not 100% sure)

3. The attempt at a solution

i need to solve for v in de Broglie's equation so i can find the wavelength. i know the mass of the electron is 9.11x10^-31kg, i know that h is Plancks constant, and i know that the work function = 7.0 x (1.602x10^-19 J) BUT how can i find v?

I tried to find v by using the photoelectric effect equation but i didnt get a correct answer:

hf = KE + Work function....BUT how can i solve for v if i dont have the frequency!?

**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!

# Homework Help: DeBroglie wavelength

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