If a supersonic plane is flying at increasing speed as the temperature decreases, what happens to the Mach number in this instance?
a. It stays the same.
b. It increases.
c. It decreases.
d. It can do any of the above.
e. It can do either (a) or (b) but not (c).
b
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Is it possible to prove, for certain, that a scientific theory is true?
A) Yes, by means of a single confirmed experiment that verifies the theory. B) Yes, by carrying out a sufficient number of experimental observations. C) Yes, by deducing it logically from other scientific theories that are known to be true. D) No, because it is always possible that a future experiment will disagree with the theory. E) No, because of the experimental error, or uncertainty, that is always present in any experimental result.
White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively
A) high temperatures. B) few molecules per spark. C) low transfer of energy. D) all of the above E) none of the above
The spectral lines are more distinct when viewed in a mercury vapor lamp under
A) high pressure. B) low pressure. C) same for each