The Crab Pulsar is pulsing in visible light 30 times per second. Why?
A) A jet ejects energy and particles from a hot spot 30 times per second.
B) It rotates 30 times per second.
C) It is eclipsed by a companion 30 times per second.
D) It's a mystery; no one really knows.
B
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Does a shell have to contain electrons in order to exist?
A) A shell is a form of energy that requires electrons in order to exist. B) A shell is just a region of space which may or may not contain electrons. C) A shell is just a conceptual model, hence, it doesn't really exist with or without the electron. D) Two of the above are reasonable answers.
The nuclear force can be all of the following EXCEPT:
Suppose we put 20 non-interacting quantons into a one-dimensional box of length L. The quantons quickly settle into the lowest possible energy states available. Roughly how many times larger will the quantons’ total energy be if they are fermions as opposed to bosons?
A. About the same B. About 4 times C. About 10 times D. About 40 times E. About 400 times
Three terrestrial-sized planets in orbits of a fraction of an AU have been found near:
A) Cygnus X-1. B) a magnetar. C) Supernova 1987A. D) a millisecond pulsar. E) a white dwarf.