1. The problem statement, all variables and given/known data A low energy, 13-watt bulb illuminates your desk from a distance of 1.2m. You can assume that it acts as a point source and that it is 100% efficient. What is the intensity (power per unit area) at the desk (in Wmˉ²)? 2. Relevant equations Velocity = Frequency * Wavelength Intensity is proportional to amplilude² 3. The attempt at a solution I don't know how to start!