Answer to Question #28280 in Other Physics for Khalid
Without knowing the beam cross-section (thickness), we can't calculate the density of energy in Joules/cm^2, but we can calculate the integral energy in joules, that's what we will do. The wavelength of the radiation is irrelevant for these calculations.
a) in t = 4 seconds, the energy delivered is E = P*t = (5 mW) * (4 s) = 20 mJ.
b) to deliver E = 5 J, the time needed is t = E / P = (5 J) / (5 mW) = 1000 seconds =& 16.67 minutes.
c) to deliver E = 30 J, the time needed is t = E / P = (30 J) / (5 mW) = 6000 seconds = 100 minutes = 1.667 hours.
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