The active volume of a laser constructed of the semiconductor GaAIAs is only `200mum^(3)` (smaller than a grain of sand), and yet the laser can continuously deliver 5.0 mW of power at a wavelength of `0.80mum`. At what rate does it generate photons?

Explanation

To find the rate at which the laser generates photons, we can follow these steps:

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