Wavelength, Electron

Air

202
0
I need to make sure my method and the formula I have used is correct. Also, my answer for the wavelength seems slightly dodgy. :uhh:

1. The problem statement, all variables and given/known data
An electron recombines with a hole losing 2.6eV of electrical potential energy. Calculate the wavelength of the light emitted.


2. Relevant equations
Not given. Equations have to be used ourself.


3. The attempt at a solution
[itex]E = \frac{hc}{\lambda}[/itex]

[itex]\lambda = \frac{hc}{E}[/itex]

[itex]\lambda = \frac{(6.63 \times 10^{-34})(3.00 \times 10^8)}{2.6}[/itex]

[itex]\lambda = 7.65 \times 10^{-26}m[/itex]
 

Dick

Science Advisor
Homework Helper
26,249
611
Put units on things and make sure they match up. You'll want to convert 2.6eV to joules.
 
You've found the most high energy photon I've ever heard of! ! ! ! Always check the units, you forgot to convert the energy from eV's to Joules.

and I see now that dick just recommended the same thing. . .
 
Last edited:

Air

202
0
How would I change eV's to Joules?
 

Dick

Science Advisor
Homework Helper
26,249
611
1eV=1.60217646*10^(-19) joules. That's what google says when I type in 'electron volt', anyway.
 

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