Consider a Helium ion with 1 electron in the ground state. It turns out that it would take about 28 eV of energy to remove this electron through ionization. Blue photons have an energy of about 4 eV So, I think this electron can emit about 7 blue photons. Do you agree?

In a ground state atom of As how many electrons total will have the quantum number l=2?

An electron in the n = 6 level drops to the n = 1 level in a hydrogen atom. Calculate the frequency of the emitted photon. Report your answer in s-1. Some potentially useful information is provided below. Please write out your work, show equation(s) that you used, etc. This will make it possible to give partial credit. (This does not have to be long. For example, if I were given the radius of a circle and asked to calculate area, the work that I would should would simply show A = pi x r^2 and then the calculation.) En = −2.18 × 10−18 J (1n2)En = -2.18 × 10-18 J (1n2) h = 6.626 ×10−34 J s h = 6.626 ×10-34 J s  c = 3.00 ×108 m/s

1. A mercury atom emits light at many wavelengths, two of which are at (1) 404.7 nm and (2) 435.8 nm . Both of these transitions are to the same final state. Determine the energy of each emitted wavelength (in J).

In a ground state atom of S how many electrons total will have the quantum number l=0?

How much energy do single photons of 453 nm and 482 nm have

3. What is the speed of an electron that has a wavelength of 550 nm?

A ground State hydrogen atom absorbs a photon of light having a wavelength of 92.3 nm .what is the final stage of the hydrogen atom?

Will an electron transition from n=3 to n=1 produce a higher energy photon than a transition from n=5 to n=1? Explain your reasoning.

The lowest five energy states in the Helijum atom (Z=2) have the following energy levels (assuming at least one electron is in the ground state.) Зр; -1,4eV _3s; -1.7eV _2p; -3.4eV _2s; -4.0eV _1s; -24.5eV A) Find one wavelength of light that you could shine on a collection of helium atoms to make a laser. Consider selection rules for all transitions. Explain your reasoning!! B) What wavelength(s) would the output laser beam have? C) Calculate the quantum efficiency of the laser.