Quantum Mechanics and Atomic Structure Incandescent Light Questions

Question Description

I’m working on a physics multi-part question and need an explanation to help me understand better.

In incandescent light bulbs, only a small percentage of energy is converted to visible light. The rest of the energy is emitted as infrared radiation (heat). A 60 W light bulb converts 20% of the incoming energy into visible light.

How many photons are emitted by the light bulb per second (1 W = 1 J s-1 ) if the wavelength is 640 nm?

Group of answer choices

1.93 x 10^20 photons/second

1.93 x 10^17 photons/second

3.87 x 10^19 photons/second

3.87 x 10^28 photons/second