After our Sun dies, will it ever undergo a nova explosion? Why or why not?
A) no, because it does not have a close binary companion
B) no, because our Sun will become a neutron star, not a white dwarf
C) yes, because our Sun will become a white dwarf
D) yes, because all stars undergo novae explosions after they die
A) no, because it does not have a close binary companion
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Astronomers know what the solar interior is like by
A. constructing a miniature Sun in the laboratory and extrapolating the results to the real Sun. B. using locally tested physics combined with observations to build a mathematical model of what the Sun should be like in its interior. C. observing the interior directly. By using the appropriate filters, it is possible to reduce the bright glow of the Sun and to peer directly at the Sun's interior. D. sending probes directly into the Sun and sending back the information.
Suppose we imagine the Sun to be about the size of a grapefruit (about 10 cm across). How far away are the nearest stars (the three stars of Alpha Centauri)?
A) 2.5 miles B) 2,500 miles C) 250 miles D) the length of a football field E) 25,000 miles
By what process do nuclear power plants on the Earth generate energy?
A) converting gravitational potential energy into electricity B) nuclear fission C) converting kinetic energy into electricity D) chemical reactions E) nuclear fusion
An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number ml could it have?
A) 6 B) 7 C) 15 D) 33 E) 98