A laser used to weld detached retinas puts out25-ms-long pulses of 640-nm light which average 0.68-Woutput during a pulse. How much energy can be depositedper pulse and how many photons does each pulse contain?

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter24: Electromagnetic Waves
Section: Chapter Questions
Problem 57P
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A laser used to weld detached retinas puts out
25-ms-long pulses of 640-nm light which average 0.68-W
output during a pulse. How much energy can be deposited
per pulse and how many photons does each pulse contain?

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