# X rays, calculate wavelength

1. Sep 15, 2010

### fluidistic

1. The problem statement, all variables and given/known data
An x-rays tube is connected to a 50 kV emf. Calculate the minimum wavelength that one can find in the radiation spectra that the tube produces.

2. Relevant equations
No idea! This is why I ask help here.

3. The attempt at a solution
Stuck at start. I've searched in google and wikipedia about calculating the wavelength of x-rays in function of the voltage across the emf, but I didn't find any formula.
So if you either know a page or a formula, feel free to share.

Edit: Nevermind I find out in wikipedia about Bremsstrahlung. It gives me $$\lambda = \frac{hc}{50 k eV}$$.

Last edited: Sep 15, 2010
2. Sep 15, 2010

### Delphi51

The theory is that the energy of one electron is transferred to one photon. There may be some loss of energy, so the theory actually gives the minimum wavelength (maximum photon energy) case.
Energy of electron = energy of photon
qV = hc/λ