Homework#3

[206190205]

Consider a single photon with a wavelength, a frequency, and an energy. What is the wavelength, frequency, and energy of a pulse of light containing 100 of these photons?

In the feedback it says that the length of exposure increases the number of photons you're exposed to. It also said the type of light does not change. So why wouldn't the energy just be fixed, instead of 100E?

[905934067]

The energy of each photon is determined by its frequency, and this relationship is expressed by the equation E = hν, where E is energy, h is Planck's constant, and ν is frequency. When you consider a pulse of light containing 100 photons, the total energy of the pulse is the sum of the energies of each individual photon. Therefore, the energy of the pulse is 100 times the energy of a single photon. While the wavelength and frequency of each individual photon remain constant, the total energy increases with the number of photons. This is because the energy of each photon adds up to contribute to the total energy of the light pulse. Hope this helps.

[Alvin Au]

For this question it is important to identify which values are dependent and independent. Each photon represents a singular unit of energy. The pulse of light contains 100 photons so therefore it has 100E. The 100 factor does not apply to wavelength and frequency because they are constants. Now, the feedback likely states that the type of light doesn't change, meaning the frequency or wavelength of the light remains constant. The total energy received during exposure increases with longer exposure times due to the higher number of photons encountered during that time.