All planets in the solar system orbit counterclockwise as seen from the north
a. True
b. False
Indicate whether the statement is true or false
True
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Suppose a white dwarf is gaining mass because of accretion in a binary system. What happens if the mass someday reaches the 1.4-solar-mass limit?
A) The white dwarf undergoes a catastrophic collapse, leading to a type of supernova that is somewhat different from that which occurs in a massive star but is comparable in energy. B) The white dwarf, which is made mostly of carbon, suddenly becomes much hotter in temperature and therefore is able to begin fusing the carbon. This turns the white dwarf back into a star supported against gravity by ordinary pressure. C) The white dwarf immediately collapses into a black hole, disappearing from view. D) A white dwarf can never gain enough mass to reach the limit because a strong stellar wind prevents the material from reaching it in the first place.
In the Bohr model of the hydrogen atom the state of the atom is characterized by a single quantum number n
Indicate whether the statement is true or false
Two flat conductors are placed with their inner faces separated by 6.0 mm. If the surface charge density on one of the inner faces is 40 pC/m2, what is the magnitude of the electric potential differences between the two conductors?
a. 36 mV b. 18 mV c. 32 mV d. 27 mV e. 14 mV
After our Sun burns its supply of hydrogen, it will become a
A) white dwarf. B) black dwarf. C) black hole. D) red giant. E) blue giant.