Question
I am Not sure what I am doing wrong on part C, but cant seem to get the correct answer!
Lasers can be used to drill or cut material. One such laser generates a series of high-intensity pulses rather than a continuous beam of light. Each pulse contains 530mJ of energy and lasts 8.0ns. The laser fires 10 such pulses per second. A lens focuses the laser beam to a 10 mu m diameter circle on the target. During a pulse, what is the light intensity on the target? Express your answer using two significant figures. The intensity of sunlight at the surface of the earth at midday is about 1100 W / m 2. What is the ratio of the laser intensity on the target to the intensity of the midday sun? Express your answer using two significant figures.
Explanation / Answer
I =0.530*10/(pi*(5*10^-6)^2)
= 67481695871 W/m^2
