A 25-watt bulb emits monochromatoc yellow …
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Yogita Ingle 5 years ago
The energy of one photon is
E= hc/λ
= (6.626×10−34Js×3×108m/s)/ 0.57×10−6
=3.487×10−19J .
25 watt corresponds to 25 J per second.
The number of photons emitted per second is 25 / 3.487×10−19=7.17×1019/s.
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