part a (9%) Problem 11: Laser beams are sometimes used to bum away cancerous tis

Question

part a (9%) Problem 11: Laser beams are sometimes used to bum away cancerous tissue. 83 100% Part (a) what is the intensity, in watts per square meter, of a laser beam that is 90.0% absorbed by a -mm diameter spot of cancerous tissue and must deposit 495Jofenergy to it in a time period of 4.15 s? Grade Summary 94% sino coso tano R 7 8 9 cota no asino acos0 4 5 6 Attempts remaining: 7 per attempt) atan0 acotano sinho 1 2 3 cosho tanho cotanh0 eDegrees O Radians Hints: 4 deduction per hint. Hints remaining 1 Feedback: deduction per feedback. Submission History Feedback 1 6.82 10 1 000682 2 1 11094187 39 Note: Feedback not accessed. I 1.109E+7 4437675 Note: Feedback not accessed. 443800

Explanation / Answer

We know that power, P = Energy/time = 495/4.15 = 119.2 J/s

We know intensity, I = Power/Area = P/0.9*pi*r2 = 119.2/0.9*3.14*(1.95/2)2*(10-3)2

=> I = 4.43*107W/m2 Answer

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