If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?
a. Galaxy A is four times closer than Galaxy B.
b. Galaxy A is four times further away than Galaxy B.
c. Galaxy A is twice as distant than Galaxy B.
d. Galaxy A is twice as close than Galaxy B.
b
RATIONALE: Make two equations, one for Galaxy A and one for Galaxy B. Then divide like terms in both equations to create one big equation to solve after eliminating similar terms.
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When frozen water on the surface of Mars heats up during summer time, the water
a. melts and forms liquid pools on the surface. b. boils off the surface and escapes into outer space. c. sublimates and goes directly into the gaseous phase. d. remains frozen because the temperature remains below the freezing point. e. melts and creates flowing rivers that erode the landscape.
The product of the frequency of a periodic wave times its wavelength gives the ________ of the wave.
Fill in the blank(s) with the appropriate word(s).
In radioactive dating, carbon-14 is often used. This nucleus emits a single beta particle when it decays. When this happens, the resulting nucleus is
A) still carbon-14. B) boron-14. C) nitrogen-14. D) carbon-13. E) carbon-15.
The Doppler Effect is the apparent change in:
a) Speed b) Light c) Sound d) Frequency