If you cover half a camera lens with opaque tape, the images produced will be
A) cut in half.
B) only dimmer.
C) both of these
D) neither of these
Answer: B
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Scientists have detected mergers of black holes that have spiraled into each other by
A) detecting gravitational waves from the merger. B) observing distant systems that produce unusually strong gamma-ray emission. C) observing distant systems that produce unusually strong radio emission. D) detecting rapidly pulsating sources of gamma-ray emission.
Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will the stars appear to your eyes?
A) You will not be able to see these two stars at all. B) The two stars will look like a single point of light. C) The two stars will appear to be touching, looking rather like a small dumbbell. D) You will see two distinct stars. E) You will see only the larger of the two stars, not the smaller one.
In which type or types of radioactive decay does the mass number of the parent nucleus not change?
A) electron capture only B) beta decay only C) alpha decay only D) beta decay and electron capture
What happens when the gravity of a massive star is able to overcome neutron degeneracy pressure?
A) Gravity is not able to overcome neutron degeneracy pressure. B) The core contracts and becomes a black hole. C) The core contracts and becomes a white dwarf. D) The star explodes violently, leaving nothing behind. E) The core contracts and becomes a ball of neutrons.