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A 20 W lamp rated 10% emits light of wav...

A 20 W lamp rated 10% emits light of wavelength y. Calculate the number of photons emitted by the lamp per second.

Text Solution

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Energy emitted by lamp per second `=10/100xx20=2W`
Energy of each photon = `(hc)/lamda`
Number of photons emitted per second can be calculated as `(2lamda)/(hc)=(2y)/(hc)`
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