Chapter 6: Q10DQ (page 1519)
Does the universe have a center? Explain.
The universe has no absolute center but infinity of arbitrary centers.
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Compare the allowed energy levels for the hydrogen atom, the particle in a box, and the harmonic oscillator. What are the values of the quantum number n for the ground level and the second excited level of each system?
Analysis of the photon absorption spectrum of a diatomic molecule shows that the vibrational energy levels for small values of n are very nearly equally spaced but the levels for large n are not equally spaced. Discuss the reason for this observation. Do you expect the adjacent levels to move closer together or farther apart as n increases? Explain.
The assumptions of the free-electron model of metals may seem contrary to reason, since electrons exert powerfulelectric forces on each other. Give some reasons why these assumptions actually make physical sense.
Neutrons have a magnetic dipole moment and can undergo spin flips by absorbing electromagnetic radiation. Why, then, are protons rather than neutrons used in MRI of body tissues?
Some lasers emit light in pulses that are only 10-12 s in duration. The length of such a pulse is . Can pulsed laser light be as monochromatic as light from a laser that emits a steady, continuous beam? Explain.
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