# Question #5669f

##### 1 Answer

#### Explanation:

I didn't get the answer of

My starting point is the following three equations from quantum physics:

- Photon Energy:

- Electron Wavelength (de Broglie equation):

- Electron Kinetic Energy:

Rearrange equation 2 to get an expression for

Now substitute that into equation 3

Rearrange equation 1 to get an expression for the wavelength

Substitute that into equation 4

Make wavelength from equations 1 and 2 equal to each other to eliminate wavelength from the equations:

Replace *E's* with the above expression.

Lastly use equation 2 to get an expression for v and substitute that into the above equation.