SETI (the Search for Extraterrestrial Intelligence) searches for communications from life in planets and moons
A) around nearby stars.
B) toward the center of the Milky Way.
C) in globular clusters.
D) in other galaxies.
E) within the solar system.
A
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Reactance: A pure inductor is connected to an ac power supply. In this circuit, the current
A. leads the voltage by 90°. B. is in phase with the voltage. C. lags the voltage by 45°. D. lags the voltage by 90°. E. leads the voltage by 45°.
What are the dimensions of the diffusion constant?
a. 
b. 
c. 
d. 
e. 
What is the crucial characteristic of an Einstein solid that makes it easier to analyze in the context of this chapter than most other kinds of thermodynamic systems?
A. The atoms are arranged in a regular, cubic lattice. B. The atoms are identical. C. Its microstates are comparatively easy to count. D. Each atom’s energy levels are equally spaced. E. ? (U, N) is always reasonably small. F. Other (specify).
As you saw in Part C, stellar parallax exists only because Earth orbits the Sun. Therefore, if the ancient Greeks had measured stellar parallax, they would have known that their belief in an Earth-centered universe was wrong. Why didn't the ancient Greeks measure stellar parallax?
A. Some Greeks actually did measure it, but they did not understand the importance of their measurements. B. Even for the nearest stars, parallax angles are too small to measure with the naked eye. C. Their belief in an Earth-centered universe meant that they did not expect parallax, and therefore did not look for it. D. The Greeks thought all the stars were the same distance away, residing on a celestial sphere.