2 votes
Accepted

Why can you not create a LED equivalent by illuminating a colored plastic casing?

You have an incoming photon that intercepts an electron on the atom, the electron gets excited to some energy level for a few femtoseconds, and then goes back to the ground state, expelling another ...
The Photon's user avatar
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1 vote

Net electric field inside a photovoltaic cell under load

Case c) open circuit: due to the built-in electric field, the light generated electrons flow to the n-side, the holes to the p-side producing a counteracting field which reduces the built-in voltage. ...
freecharly's user avatar
  • 16.1k
1 vote

Interpretation of velocity in the de Broglie wavelength of an electron in a crystal

The relation between (de Broglie) wavelength and wave vector of a sinusoidal wave is always 𝜆 =2𝜋/𝑘. Thus your formula 𝜆 = 2𝜋𝑚∗/𝑘 cannot be correct. The effective mass in it makes it ...
freecharly's user avatar
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