How fast must an electron move to have a kinetic energy equal to the photon energy of sodium light at wavelength 588 nm?

Explanation

To find the speed at which an electron must move to have a kinetic energy equal to the photon energy of sodium light at a wavelength of 588 nm, we can follow these steps:

### Step 1: Calculate the Photon Energy
The energy of a photon can be calculated using the formula:
\[ E = \frac{hc}{\lambda} \]
where:
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