An electron is in an infinite one-dimensional square well of width L = 0.12 nm.

a. First, assume that the electron is in the lowest energy eigenstate of the well (the ground state). What is the energy of the electron?
b. What is the wavelength that is associated with this eigenstate?
c. What is the probaility that the electron is located within the region between x = 0.048 nm and x = 0.072 nm?
d. Now, assume the electron is in the energy eigenstate that is the closest in energy to that of the ground state. What is the probability that the electron in this state is located within the region between x = 0.048 nm and x = 0.072 nm?

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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