A laser is used in eye surgery to weld a detached retina, Ask an Expert

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A laser is used in eye surgery to weld a detached retina back intoplace. The wavelength of the laser beam is 514 nm, while the poweris 1.5 W. During surgery, the laser beam is turned on for 0.050 s.During this time, how many photons are emitted by the laser?

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