The electromagnetic waves with the highest energy are ________.
A. gamma rays
B. microwaves
C. ultraviolet light
D. visible light
E. X-rays
Answer: A
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One hundred meters of a certain type of wire has a resistance of 7.2 
What is the resistance of 2.5 m of this wire?
A. 18
B. 1.8
C. 0.18
D. 3.0
E. 0.30
Redshift surveys give us:
A) an idea of how turbulent the intergalactic gas is. B) a 3-D layout of galaxies in space. C) the total mass of the universe. D) a more accurate census of the Local Group. E) a better value of the speed of light.
If the density is less than critical, which fate of the universe awaits us?
What will be an ideal response?
Suppose a 5.0-meter diameter telescope were constructed on the dark side of the moon. The viewing there (except for brief periods of sunlight) would be excellent. As an example, what would be the separation between two objects that could just be resolved on the planet Mars in 500 nm light? [The distance to Mars at closest approach is 50 million miles.]