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1			Why does a particle confined to a finite box have only a finite number of bound states?
2			Why does a confined particle have quantized energy levels?
3			When a particle's kinetic energy increases, what happens to its de Broglie wavelength?
4			A fly with a mass of 1.0 × 10-4 kg crawls across a table at a speed of 2 mm/s. Compute the de Broglie wavelength of the fly and compare it to the size of a proton (about 1 fm).
5			What is the ratio of the wavelength of a 0.100-keV photon to the wavelength of a 0.100-keV electron?
6			What is the de Broglie wavelength of an electron moving at speed 3/5 c?
7			An electron passes through a slit of width 1.0 × 10-8 m. What is the uncertainty in the electron's momentum component in the direction perpendicular to the slit but in the plane containing the slit?
8			What are the possible values of Lz (the component of angular momentum along the z-axis) for the electron in the second excited state (n = 3) of the hydrogen atom?
9			What is the largest number of electrons with the same pair of values for n and l that an atom can have?