Monochromatic light of wavelength 632.8 ...

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW.
How many photons per second , on an average , arrive at a target irradiated by this beam ? (Assume the beam to have uniform cross-section which is less than the target area)

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Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How many photons per second , on an average , arrive at a target irradiated by this beam ? (Assume the beam to have uniform cross-section which is less than the target area)

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Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW.
How many photons per second , on an average , arrive at a target irradiated by this beam ? (Assume the beam to have uniform cross-section which is less than the target area)