How can a star that has more mass than our sun be smaller than our sun?
Ans: The star could be denser than our sun.
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A 1056-hertz tuning fork is struck at the same time as a note on the piano and you hear 2 beats/second. You tighten the piano string very slightly and then hear 3 beats/second. What is the frequency of the piano string?
A) 1053 hertz B) 1054 hertz C) 1056 hertz D) 1058 hertz E) 1059 hertz
Enrico says that positive charge is created when you rub a glass rod with silk, and that negative charge is simply the absence of positive charge. Rosetta says that negative charge is created and that positive charge is the absence of positive charge. (She has heard that Ben Franklin should have reversed the signs he associated with the charges.) Which one, if either, is correct?
A. Enrico, because there really is only one kind of charge. B. Rosetta, because there really is only one kind of charge. C. Neither: although no charge is present originally, both types of charge are created through friction. D. Both: only one type of charge is created by friction at any one time. E. Neither: both negative and positive charge are present simultaneously in all solid materials on Earth and the process described involves a transfer of charge, not the creation of charge.
What is the binding energy of 12C? The mass of an atom of 12C is 12 u (exactly), of an atom of 1H is 1.007825 u, and of a neutron is 1.0086649 u.
A. 137 MeV B. 104 MeV C. 92.2 MeV D. 46.1 MeV E. 7.68 MeV
An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. What is the magnitude of the orbital angular momentum L of the atom?
A) 1.0? B) 1.2? C) 1.4? D) 1.7? E) 2.0?