A math xmlns=http://www.w3.org/1998/Math/MathMLmn100/mn/math watt bulb emits monochromatic ...

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A math xmlns=http://www.w3.org/1998/Math/MathMLmn100/mn/math watt bulb emits monochromatic light of wavelength \( 400 \mathrm{~nm} \). Calculate the number of photons emitted per second by the bulb.
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