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CMATT

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Thread moved from the technical forums -- poster has been reminded of the PF rules

What is the intensity in W/m² of a laser beam used to burn away cancerous tissue that, when 94.0% absorbed, puts 539 J of energy into a circular spot 2.11 mm in diameter in 4.00 s??

I've tried a couple different equations and I keep getting the answer wrong. This is due tonight, I'm super stuck. Any input is greatly appreciated

I've tried a couple different equations and I keep getting the answer wrong. This is due tonight, I'm super stuck. Any input is greatly appreciated