When sound travels faster near the ground than above, bending of sound tends to be
A) upward.
B) downward.
C) to the left.
D) to the right.
E) none of the above
Answer: A
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If the principal quantum number for hydrogen is 7, which one of the following is not a permitted orbital magnetic quantum number for that atom?
a. 10 b. –2 c. 0 d. 5 e. 3
An important feature of the Carnot cycle is that
A) its efficiency can be 100%. B) its efficiency depends only on the absolute temperature of the hot reservoir used. C) its efficiency is determined by the temperatures of the hot and cold reservoirs between which it works and by the properties of the working substance used, and on nothing else. D) it is an example of an irreversible process that can be analyzed exactly without approximations. E) no engine can be more efficient than a Carnot engine operating between the same two temperatures.
Niels Bohr focused his attention on the element hydrogen because it
a. could be obtained in extremely high purity. b. was so abundant. c. had the simplest atom. d. was inexpensive.
Some elements like iron, cobalt, and holmium make very good natural magnets. Which of the following statements best describes why?