Which interacts more with sounds of relatively high frequencies?
A) large bells
B) small bells
C) both the same
Answer: B
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Which two things are the same for all observers according to the theory of relativity?
A) (1) the laws of nature and (2) the speed of light B) (1) the laws of nature and (2) the rate at which time proceeds C) (1) the speed of light and (2) the simultaneity of events D) (1) the rate at which time proceeds and (2) the simultaneity of events E) (1) the size of moving objects and (2) the mass of moving objects
A photon hitting an electron (mass m) at rest can create an electron–antielectron pair in addition to the original electron. Assume that the two electrons and the positron move away from the collision at rest with respect to each other afterward. What was the photon’s initial energy?
A. Zero B. m C. 2m D. 3m E. 4m
Energetically, a fusion reaction can be self-sustaining whenever
A) the reaction obeys the principle of conservation of total energy. B) the reaction proceeds from higher to lower energies on the nuclear energy curve. C) the reaction proceeds from heavier to lighter nuclei on the nuclear energy curve. D) the reaction proceeds from lighter nuclei to heavier nuclei on the nuclear energy curve. E) the reaction proceeds from lower to higher energies on the nuclear energy curve.
At an altitude of 3 times the radius of the Earth, the acceleration due to gravity is
a. g/3. c. g/27. b. g/9. d. not given.