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[" 4.Monochromatic light of wavelength "...

[" 4.Monochromatic light of wavelength "667],[" nm is produced by a helium neon laser."],[" The power emitted is "9" mW.The number "],[" of photons arriving per second on the "],[" average at a target irradiated by this beam "],[" is "],[[" (a) "9times10^(17)" (b) "3times10^(16)" (c) "9times10^(15)" (d) "3times10^(19)]]

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