Question: The output power of a laser pointer is about 1 mW. (a) What are the energy and momentum of one laser photon if the laser

The output power of a laser pointer is about 1 mW.
(a) What are the energy and momentum of one laser photon if the laser wavelength is 670 nm?
(b) How many photons per second are emitted by the laser?
(c) What is the average force on the laser due to the momentum carried away by these photons?

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