Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take for a sample of americium to lose one-third of its nuclei?
A) 2960 s
B) 10.6 × 103 years
C) 4.32 × 103 years
D) 6.44 × 103 years
E) 7.84 × 103 years
C
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Which of the following features of the Solar System does the solar nebula hypothesis explain?
A. All the planets move in orbits that lie in nearly the same plane. B. All the planets and the Sun, to the extent that we know, are the same age. C. All the planets orbit the Sun in the same direction. D. The planets nearest the Sun contain only small amounts of substances that condense at low temperatures. E. All of these choices are correct.
Which of the following devices is placed into a circuit to measure the current that passes through it?
a) ammeter b) gaussmeter c) voltmeter d) diffractometer e) flowmeter
Which of the following is an example of a nonconservative force?
a. gravity b. magnetism c. friction d. Both choices A and B are valid.
What type of faulting results from stresses parallel to the fault plane?
a. Reverse b. Normal c. Abnormal d. Strike-slip