How do you calculate the energy, in eV, off a photon of light of wavelength 490 nm?
1 Answer
You can do it like this:
Explanation:
To find the energy of a photon you use the Planck Expression:
This becomes:
If 1 Coulomb of charge is moved through a potential difference of 1 Volt then 1 Joule of work is done.
The electron volt is the work done in moving 1 electron through a potential difference of 1 Volt.
The charge on the electron is taken here to be