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A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 491 nm,

A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 491 nm, while the power is 1.9 W. During surgery, the laser beam is turned on for 0.058 s. During this time, how many photons are emitted by the laser? Number i Units No units J m deg N m/s

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