Week 3: HW 3-Ch 15 Problem 15.35- Enhanced with Feedback 15 of 23 Part A Constan

Question

Week 3: HW 3-Ch 15 Problem 15.35- Enhanced with Feedback 15 of 23 Part A Constants What is the power of one laser pulse? LASIK eye surgery uses pulses of laser light to shave off tissue from the comea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser beam witha wavelength of 193 nm. Each laser pulse lasts 20 ns and contains 1.8 mJ of light energy. Express your answer to two significant figures and include the appropriate units. You may want to review (Pages 484-485) P-Value Units Submit Request Ans Part B During the very brief time of the pulse, what is the intensity of the light wave? Express your answer to two significant figures and include the appropriate units. I- Value Units Submit Request Ans

Explanation / Answer

Given,

d = 10 mm => r = 5 mm ; lambda = 193 nm ; t = 20 ns ; E = 1.8 mJ

A)We know that

P = E/t

P = 1.8 x 10^-3/(20 x 10^-9) = 9 x 10^4 W

Hence, P = 9 x 10^4 W

b)Intensity is:

I = P/A

I = 9 x 10^4/(3.14 x 0.0005^2) = 1.15 x 10^11 W/m^2

Hence, I = 1.15 x 10^11 W/m^2

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