A leaser emits monochromatic radiation of wavelength 663 nm. If it emits `10^(5)` quanta per second per square metre, calculate the power output of the laser in joule per square metre per second.

Explanation

To calculate the power output of the laser in joules per square meter per second, we can follow these steps:

### Step 1: Convert the wavelength from nanometers to meters.
The wavelength given is 663 nm. We need to convert this to meters:
\[ \text{Wavelength} = 663 \, \text{nm} = 663 \times 10^{-9} \, \text{m} \]

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