Can someone explain in detail how to do this problem? If 5 percent of the energy

Question

Can someone explain in detail how to do this problem? If 5 percent of the energy supplied to an incandescent lightbulb is radiated as visible light, how many "visible" photons persecond are emitted by a 100-watt bulb? Assume the wavelengthof all visible light to be 560 nm. 1 watt = 1 J/s Answer: 1.4 x 1019 photons/s Can someone explain in detail how to do this problem? If 5 percent of the energy supplied to an incandescent lightbulb is radiated as visible light, how many "visible" photons persecond are emitted by a 100-watt bulb? Assume the wavelengthof all visible light to be 560 nm. 1 watt = 1 J/s Answer: 1.4 x 1019 photons/s

Explanation / Answer

lets find the energy released by light so... c/wavelength to get freq and then freq*h to get Energy so.... 3e8/560e-9= 5.35e14 so times planks constant to get energy energy = 3.55e-19 so to find joules we use we convert 100 watts to 100 joules so 5 percent is 5 joules so.. 5 joules / energy released to find photons persecondso.... 5/3.55e-19 = 1.4e19

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