What is the period of a signal that has a frequency of 60 Hz?
a. 60 s c. 1/60 s
b. 60 s-1 d. not determinable
C
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What is the main factor that makes Earth more geologically active than the other terrestrial planets?
A) It is larger, so it has retained its internal heat for longer. B) It is farthest from the Sun, so it receives less light. C) It has a large Moon, so it is heated by tidal forces. D) It has far more radioactive material than other planets. E) It formed much later than the other planets.
Which constellation lies in the direction toward the galactic center?
A) Orion B) the Big Dipper C) Leo D) Sagittarius E) Taurus
Which of the following is not the usual outcome of nuclear fission?
a. The binding energy per nucleon of the fission fragments is smaller than that of the original nucleus. b. Energy is released. c. Neutrons are released. d. The fission fragments are radioactive.
The frequency of a flood event and its magnitude is known as
What will be an ideal response?