The work function of tungsten is 4.50 eV. Calculate the speed of the fastest electrons ejected from a tungsten sur- face when light whose photon energy is 5.80 eV shines on the surface.

Explanation

To solve the problem of finding the speed of the fastest electrons ejected from a tungsten surface when exposed to light, we can follow these steps:

### Step 1: Understand the Given Information
- Work function of tungsten, \( \phi = 4.50 \, \text{eV} \)
- Energy of the incident photons, \( E_{\text{photon}} = 5.80 \, \text{eV} \)

### Step 2: Calculate the Maximum Kinetic Energy of the Ejected Electrons
The maximum kinetic energy (\( KE_{\text{max}} \)) of the ejected electrons can be calculated using the equation:
...