Photons and electrons

[Clara Cho 2K]

How do you calculate how many photons in total cause electron excitations? How do you determine how many electrons are excited assuming one photon interacts with one hydrogen atom?

[SGonzales_3L]

For these questions you could use conversion ratios. For the first question, you'd determine how much energy one photon carries. Then you'd divide the 100kJ of energy to determine how many photons carry the given amount of energy. For the second question, you'd convert the number of photos using rations (1 H atom:1 photon)(1 mol H/6.02214 x 10²³ H atoms) to get the moles of excited Hydrogen.

[edward_brodell_2I]

Each photon wavelength corresponds with the energy difference of the energy level so the amount of energy and the energy per electron can be used to determine how many electrons or with what number of electrons have the specific energy level based on the photoelectirc effect and the kinetic energies. Usually calculations also will involve 1 mol of electrons because often experimental data interacts with 1 mole of the sample and from there you can calculate based on electron distributions, the amount of energy an electron has at a given energy level.