A sound wave in brass has a displacement amplitude of 3.00 mm. The frequency of the sound wave 750 Hz and the velocity is 2,813 m/s. If the density of brass is 
then what is the pressure amplitude of the sound wave?
A. 
B. 
C. 
D. 
E. 
E.
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The drawing below shows a sequence of Stern–Gerlach devices. By analogy to the cases discussed in the chapter, what do you think are the probabilities that an electron entering the last device will come out of that device’s plus and minus channels, respectively? 
A. 1 and 0, respectively (AA if reversed, i.e., 0 and 1)
B. 0.933 and 0.067, respectively (BB if reversed)
C. 
, respectively (CC if reversed)
D. 
for both channels
E. Some other probabilities (specify)
A star on the main sequence has 7 solar masses. The star will evolve into a ____________ and its core will be supported by ______________.
a. white dwarf, electron degeneracy pressure b. neutron star, neutron degeneracy pressure c. black hole, no pressure (i.e., it will not be supported) d. white dwarf, neutron star, or black hole; electron degeneracy, neutron degeneracy, and no pressure, respectively.
The maximum theoretical efficiency of a Carnot heat engine operating between reservoirs at the steam point and at room temperature is about:
A. 10% B. 20% C. 50% D. 80% E. 99%
The discovery of the cosmic microwave background was important because
A) its detection was a major advance in microwave testing. B) it was experimental verification of a prediction from the Big Bang theory. C) it showed the universe must be closed, with more than the critical density here. D) it established a firm center of the universe. E) it proved that astronomy at radio wavelengths was possible.