Problem: Laser beams are sometimes used to burn away cancerous tissue.  What is the intensity, in watts per square meter, of a laser beam that is 90.0% absorbed by a 1.95-mm diameter spot of cancerous tissue and must deposit 495 J of energy to it in a time period of 4.15 s?

FREE Expert Solution

Power, P=Energy, Etime, t

1Watt, (W)=1 Joule (J)1 second (s)

Intensity, I=P (W)Area (m2)

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Problem Details

Laser beams are sometimes used to burn away cancerous tissue.  

What is the intensity, in watts per square meter, of a laser beam that is 90.0% absorbed by a 1.95-mm diameter spot of cancerous tissue and must deposit 495 J of energy to it in a time period of 4.15 s?