Waves physics question

Question

Treat a firefly as an isotropic source of light. 4.55 m away from a firefly, you measure an intensity of 2.41×10^-8 W/m². What is the power output of this source? Convert your answer and enter it with units of uW (microwatts, where "micro-" = ×10⁻⁶). If this light were focused into a laser beam with a radius of 1.83 mm, what would be the intensity of light within the beam? Enter the units as W/m^2

Answer 1

Hi Zachariah W.,

You've submitted your entire physics problem set as questions? Not what Wyzant is for. Please be more selective!

-- Cheers, -- Mr. d.