What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light.
B) The light that they emit is so weak that it is undetectable to our telescopes.
C) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily.
D) They interact with other matter only through the weak force and not through gravity or any other force.
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light.
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Say you are on the top of Mount Nittany. How does the force of gravity compare to what it would be at the bottom of Happy Valley?
A) two times greater on Mount Nittany than in Happy Valley B) exactly equal on Mount Nittany and in Happy Valley C) two times less on Mount Nittany than in Happy Valley D) slightly less on Mount Nittany than in Happy Valley E) slightly greater on Mount Nittany than in Happy Valley
Two otherwise identical light waves arriving at the same point with peak matching valley undergo
a. constructive interference. b. destructive interference. c. polarization. d. none of the above.
A black hole consists of a large ________ in a small space.
Fill in the blank(s) with the appropriate word(s).
A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly above the fish? (For water, n = 1.33.)
a. 50 b. 60 c. 40 d. 70 e. 110