A monochromatic source emits light of wavelength 500 nm and has a power output of 25 W. Find the number of photons emitted by this source in 5 minutes .

Explanation

To solve the problem of finding the number of photons emitted by a monochromatic source in 5 minutes, we can follow these steps:

### Step 1: Convert the wavelength from nanometers to meters
The given wavelength is 500 nm. To convert this to meters:
\[ \text{Wavelength} (\lambda) = 500 \, \text{nm} = 500 \times 10^{-9} \, \text{m} \]

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