Atomic Spectra Post Module #29 [ENDORSED]

[Sarah Brecher 1I]

The question states:

In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. What is the energy per photon of light emitted?
How many photons of infrared radiation does the lamp generate in 1.0 s?

I figured out the energy per photon of light emitted by just using the given wavelength. How do you calculate the second part of the question? Do you use the watts and joules given? Thanks!

[Noah Carey 1G]

If you divide the 11 Joules of energy by the amount of energy per photon you calculated in the first step, you will get the number of photons of infrared radiation generated.

[Madison Hacker 1L]

What you calculated is joules per photon, so you would take the total energy emitted (11 J) and divide it by joules per photon, giving photons!

[Lenaschelzig1C]

To find the number of photons. you would use a chart like Figure 1.1 in the textbook to find the energy of one photon, and then divide the total energy of the source by the energy of one photon to find the number of photons.