What evidence do we have that the halo population of stars are older than other stars in the galaxy?
A) They are farther away.
B) They have higher masses than other stars in the galaxy.
C) They have fewer planets.
D) They have a smaller proportion of heavy elements.
E) They move slower than other stars in the galaxy.
D
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A sound wave in water has an intensity of
The density of water is 
and the velocity of sound in water is 1,482 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
Aristotle treated motion by
A) comparing the distance traveled with the time of travel. B) measurements of distance traveled. C) dividing it into two classes. D) all of the above
Describe the seafloor spreading theory
What will be an ideal response?
Which of the following is quantized?
A) energy B) radiation C) number of atoms in a gold bar D) electric charge E) all of the above