Question
A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is $514 \mathrm{nm}$ and the power is 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?
A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is $514 \mathrm{nm}$ and the power is 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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A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20.0 ms in duration. The average power during each pulse is 0.600 W. (a) How much energy is in each pulse in joules? In electron volts? (b) What is the energy of one photon in joules? In electron volts? (c) How many photons are in each pulse?
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