1: Phosphors that coat the inside of a flourescent lamp convert ultraviolet radiation (from the mercury vapor discharge inside the tube) into visible light. Make a schematic diagram of the allowed atomic energy levels that illustrates how this works. Could one also make a phosphor that converts visible light to ultraviolet?

2: You find that when UV light with a wavelength of 254 nm from a mercury arc falls upon a clean copper surface, the stopping potential necessary to stop emission of photoelectrons is 0.181 V. a) What is the photoelectric threshold wavelength for this copper surface? b) What is the work function for this surface?

3: Calculate the allowed "Bohr" orbits for a satellite orbiting the earth. What is the quantum number "n" for a 20.0 kg satellite that circles the earth once every 2.00 hours at a radius of 8060 km. What is the distance between this orbit and the next allowed orbit? Is it possible to observe the difference between these orbits? Discuss whether or not your calculation makes sense in terms of when quantum mechanics and classical mechanics should agree.

4: Which device can resolve smaller details in a sample: and electron microscope or a visible light microscope? Why?

5: I’m studying a baseball moving through a region of space. Is it possible for me to measure it’s momentum and position and calculate where it will be 2 seconds from now?

Suppose I am studying a small particle instead of a baseball … can I do the same thing?

A sample of atoms is prepared so they each have electrons in an excited metastable state with a lifetime of 3.7 ms. The electrons eventually drop down into the ground state and emit light in the process. How well known is the energy of the electron in the metastable state? How wide is the spectral line emitted by these atoms as the electron drops back into the ground state?

6: Some fraction of you are struggling to reach the point where you get paid to study x-ray photographs of the innards of people. Radio waves pass through bodies too … Why don’t we make radiowave photos of the body to study as a diagnostic tool? What is the physical process that produces the x-rays used in medicine? Can a hydrogen atom emit x-rays?

7: Estimate roughly the momentum of protons bound within an atomic nucleus. How might this effect the results of an experiment that scatters a beam of particles off nuclei?

8: Explain, in terms of our picture of the multi-electron atom, why iron, cobalt, and zinc have similar chemical properties.