A laser is used in eye surgery to weld a detached retina, Physics

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A laser is used in eye surgery to weld a detached retina

A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 470 nm, while the power is 2.2 W. During surgery, the laser beam is turned on for 0.049 s. During this time, how many photons are emitted by the laser?

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Physics: A laser is used in eye surgery to weld a detached retina

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