A he-ne laser produces light of wavelength 633 nm with
A He-Ne laser produces light of wavelength 633 nm with intensity 1.02 103 W/m2, over a beam of cross-sectional area 0.940 mm2. How many photons per second are emitted by the laser?
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a he-ne laser produces light of wavelength 633 nm with intensity 102 103 wm2 over a beam of cross-sectional area 0940
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