A laser emits at 424 nm in a single pulse that lasts `0.500mus`. The power of the pulse is 3.25 MW. If we assume that the atoms contributing to the pulse underwent stimulated emission only once during the `0.500mus`, how many atoms contributed?

Explanation

To solve the problem step by step, we will calculate the total energy emitted by the laser pulse and then determine how many atoms contributed to that energy based on the energy emitted per atom.

### Step 1: Convert Wavelength to Meters
The wavelength of the laser is given as 424 nm. We need to convert this to meters:
\[ \lambda = 424 \, \text{nm} = 424 \times 10^{-9} \, \text{m} \]

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