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The following is a standard problem found in many textbooks:

Problem: Using a mixture of CO₂, N₂, and sometimes He, CO₂ lasers emit a wavelength of 10.5 µm. At power outputs of 0.110 kW, such lasers are used for surgery.

A- How many photons per second does a CO₂ laser deliver to the tissue during its use in an operation?

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