1. Compared to blue photons, red photons
   1. move slower
   2. move faster
   3. have longer wavelength and more energy
   4. have shorter wavelength and more energy
   5. have longer wavelength and less energy

2. Photon A has 100 times the energy of Photon B. Photon C has has twice the energy of Photon B. Which of the following is true?
   1. The speed of Photon B is greater than the speed of Photon A
   2. The speed of Photon B is greater than the speed of Photon C
   3. Photon A has the shortest wavelength
   4. Photon C has the shortest wavelength
   5. all the wavelengths are the same since A,B and C are all photons

3. Two stars have identical radius. Star A has a temperature of 5000 degrees and Star B has a temperature of 7000 degrees.
   1. Star A and B output the same energy because their radius is the same
   2. Star B outputs about 40% more energy
   3. Star B outputs twice as much energy
   4. Star B outputs 4 times more energy
   5. Star B outputs 2000 times more energy

4. Suppose some simplified atom has 3 energy states. The ground state has zero energy, the first excited state has energy = 5 units above the ground state and the second excited state has energy = 7 units above the ground state. If an electron resides in the first excited state, which of the following can happen?
   1. It can absorb a photon of energy = 7 units
   2. It can emit two photons, one with energy = 5 and one with energy = 7
   3. It can absorb a photon of energy = 5 units
   4. It can emit a photon of energy = 2 units
   5. none of the above

5. Suppose the electron is now in the second excited state and then falls back to the first excited state, stays there momentarily and then falls back to the ground state. Which of the following will happen?
   1. two photons of energy = 7 units will be emitted
   2. a photon of energy 2 and a photon of energy = 5 will be emitted
   3. a photon of energy 2 will be absorbed and a photon of energy 5 will be emitted
   4. all of the above can happen
   5. none of the above will happen

6. Suppose the electron is in the ground state. Which of the following can happen?
   1. a photon of energy = 5 units will be emitted
   2. photons of energy = 5 or 7 units can be absorbed
   3. only a photon of energy = 2 units can be absorbed
   4. a photon of energy = 6 units can ionize the atom
   5. none of the above

7. If the electron is in the ground state and a photon of energy 10 is incident upon the atom, what will happen?
   1. nothing
   2. two photons of energy 5 will be emitted
   3. the atom will be come ionized
   4. the electron will oscillate between the first and second excited state
   5. 7 units of photon energy will be used to move the electron to the highest excited state, leaving behind a photon of energy 3.

8. In the Chemical Fingerprint exercise that you did in Module D element AX was identified with
   1. Carbon
   2. Boron
   3. Nitrogen
   4. Flurine
   5. Hydrogen

9. Hydrogen lines are strongest in
   1. A stars
   2. B stars
   3. G stars
   4. K stars
   5. none of the above; they are equal in strength in all stars

10. Validation: upload your completed worksheet for the stellar spectrum simulation before gaining access to Module 3.