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Question: 

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? [Hint: See Example 27–4.]

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$0.017 \textrm{ J, } 5.5 \times 10^{16} \textrm{ photons/pulse}$

Giancoli 7th Edition, Chapter 28, Problem 41

(1:90)

Chapter 28, Problem 41 is solved.

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