Using a mixture of CO 2 , N 2 , and sometimes He, CO 2 lasers emit

Question:

Using a mixture of CO₂, N₂, and sometimes He, CO₂ lasers emit a wavelength of 10.6 µm. At power outputs of 0.100 kW, such lasers are used for surgery. How many photons per second does a CO₂ laser deliver to the tissue during its use in an operation?

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