There are samples of two different isotopes, X and Y. Both contain the same number of radioactive atoms. Sample X has a half-life twice that of Y. How do their decay rates compare?
a. X has a greater rate than Y.
b. X has a smaller rate than Y.
c. The rates of X and Y are equal.
d. The rate depends on atomic number, not half-life.
b
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When 2.000 kg of water evaporates,
What is the entropy change in the boiling process?
A. 12,120 J/K B. 8,566 J/K C. 6,750 J/K D. 5,844 J/K
An object weighing 4.00 N falls from rest subject to a frictional drag force given by Fdrag = bv2, where v is the speed of the object and What terminal speed will this object approach?
A) 1.78 m/s B) 3.42 m/s C) 1.15 m/s D) 2.25 m/s E) 0.75 m/s
The beam in a cathode-ray tube is composed of
A) photons. B) electrons. C) both of these D) neither of these
The P-V diagram of a cyclic process shows a curve that encloses an area. The work done by the heat engine, represented by the enclosed area, is positive when the path around the area proceeds in which of the following fashions?
a. clockwise c. It is always positive. b. counterclockwise d. It is always negative.