Energy Carried by Electromagnetic Waves Video Lessons

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# Problem: LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser beam with a wavelength of 193 nm. Each laser pulse lasts 16 ns and contains 1.6 mJ of light energy.Part A. What is the power of one laser pulse?Express your answer to two significant figures and include the appropriate unitsPart 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

###### FREE Expert Solution

Power:

$\overline{){\mathbf{P}}{\mathbf{=}}\frac{\mathbf{E}}{\mathbf{t}}}$, where E is energy and t is time.

Intensity:

$\overline{){\mathbf{I}}{\mathbf{=}}\frac{\mathbf{P}}{\mathbf{A}}}$, where P is power and A is the area covered by the laser beam.

Part A

We're given:

E = 1.6 mJ = 1.6 × 10-3 J

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###### Problem Details

LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser beam with a wavelength of 193 nm. Each laser pulse lasts 16 ns and contains 1.6 mJ of light energy.

Part A. What is the power of one laser pulse?
Express your answer to two significant figures and include the appropriate units

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