A watt is a unit of energy per unit time, and one watt (W) is equal to one joule per second (Jasa 1) A 60.0 W incandescent lightbulb produces about 5.00% of its energy as has an average wavelength of 5100 nm. calculate how many such photons are emitted per second by a 60.0W incandescent lightbulb.
The amount of energy emitted as light per second is:
The energy in one photon is:
where is the Planck's constant, and is the frequency of the light. The frequecncy is given as follows:
where is the speed of light, and is the wavelength.
Thus, the number of the photons:
Answer. .
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