How fast must an electron move to have a kinetic energy equal to the photon energy of sodium light at wavelength 500 nm?

Explanation

To find out how fast an electron must move to have a kinetic energy equal to the photon energy of sodium light at a wavelength of 500 nm, we can follow these steps:

### Step 1: Calculate the energy of the photon

The energy of a photon can be calculated using the formula:

\[
E = \frac{hc}{\lambda}
...