    Question

# Two bulbs A and B emit red light and yellow light at 8000 A∘ and 4000 A∘ respectively. The number of photons emitted by both the bulbs per second is the same. If the red bulb is labelled as 100 watts, find the wattage of the yellow bulb.

A
200.00
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B
200
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C
200.0
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Solution

## Let, n be the no. of photons emitted by bulbs per second & W be the wattage of yellow bulb. Since, Power (Wattage) =n× Energy of one photon For red bulb, 100=n×124008000×1.6×10−19 ...(i) For yellow bulb, W=n×124004000×1.6×10−19 ...(ii) Since, value of n i.e. number of electrons emitted per second, is same for both bulb, we can solve (i) and (ii), we get: W=200 watts  Suggest Corrections  0      Similar questions  Related Videos   Planck's Quantum Hypothesis
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