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QAIPM-2012-Ph-1773: NEET 2012 Physics - Class 12 AIPM-2012-Ph-1773 Solution: A 200 W sodium street lamp emits yellow light of wavelength…
A 200 W sodium street lamp emits yellow light of wavelength . Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is
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Step-by-Step Verified Solution
Efficient power, P = N t _ h c _
_ N t = 25 100 _ 200 ( 6.6 _ 10 _ 34 ) ( 3 _ 10 8 ) 0.6 _ 10 _ 6 = 1.5 _ 10 20