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        if 5% of the energy supplied to an incandescent light bulb is radiated as visible light, how many visible light photons are emitted by 100 watt bulb? assume wavelength of all visible photons to be 5600*10 raise to the power -10.
2 years ago

Arun
23478 Points
							Dear Kashish $\lambda$ = 5600 AEnergy of one photon is E = h$\nu$ = h*c/$\lambda$E = 6.63* 10^-34 * 3* 10^8/(5600* 10^-10) = 3.616 * 10^-19 JA 100 watt bulb requires 100 joule of energy per second. Energy radiated by the bulb as visible light per second = 5% of 100= 5 Joule Number of photons emitted per second=Energy radiated per sec/ energy of one ohoton= 5/(3.616 * 10^ -19) = 1.38 * 10^19 RegardsArun (askIITians form expert)

2 years ago
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