Question

anyone good with modern physics?

Answer 1

shoot the question buddy

Answer 2

Certain toys found in cereal boxes display the phenomenon of phosphorescence. If a
child exposes the toy to a bright light (for example, the Sun), then the toy will glow with
a characteristic color when the child takes it into a dark closet.
The phenomenon of phosphorescence requires the interaction of light with three
energy levels in an atom (or molecule). The figure below shows a hypothetical energy
diagram in which the lowest state shown is the ground state (E = 0). When the toy is
taken into the Sun, a photon causes a transition from the ground state to state 2. Almost
immediately, the atom emits a photon, making a fast transition to state 1.
The atom makes a transition to the ground state only slowly. Thus when the child
takes the toy into a closet, he/she is able to observe the phosphorescent photons from
this final transition. The transition from state 1 to the ground state is said to be
forbidden, it takes place by a different (and thus slower) process than the other
transitions.
Let fabs be the frequency of the absorbed photons, ffl be the frequency of the photons
emitted while the object is still in the sunlight, and fph be the frequency of the photons
released in the closet. (Planck’s constant is h = 4.14×10-15 eV.s.)

Answer 3

How does fabs compare to fph?

Answer 4

http://recent-science.com/index.php/rrst/article/viewfile/14865/7567

Answer 5

thats the hole model

Answer 6

that's a research paper, not sure if it will help me with my hw

Answer 7

If the frequency of the incoming light is great enough, there should be enough energy to break off the electron and have some left over to give it some kinetic energy. So…



h f = Ek max + W

Answer 8

W = work function (J or eV)

h = Planck’s constant

fo = threshold frequency (Hz)