A Doppler effect occurs when a source of sound moves
A. away from you.
B. toward you.
C. either of these
D. none of the above
Answer: C
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Isotopes of the same element have ____
a. different numbers of protons, but the same number of neutrons b. the same number of electrons, but different numbers of neutrons c. different numbers of neutrons, but the same number of protons d. different numbers of electrons, but the same number of neutrons e. different numbers of protons and neutrons
The innermost layer of the Earth, which is composed of iron and nickel metal, is the ________
a. lithosphere b. crust c. mantle d. core
The most important principle underlying the Bergeron process is this:
A) for a given temperature, the saturation vapor pressure of ice is less than that for supercooled water. B) large drops fall faster than smaller drops. C) aggregation takes place more rapidly than accretion. D) the bottom part of the cloud where the process is taking place must be warmer than 0 degrees Celsius.
A statement you will sometimes hear people say is that a day is not 24 hours but is really 23 hr. 56 min. and 4 sec. What does this refer to?
A) Our clocks drift that much each day, and we average out the affect with period time shifts, like leap years and leap seconds. B) This is sidereal time, not solar time; a solar day is 24 hours. C) It is just an urban geek myth; the day really is 24 hours long. D) The original definition of the hour was off, and with more accurate atomic clocks we now realize the real day is this length.