If the temperature T of an ideal gas is increased at constant pressure the mean free path:
A. decreases in proportion to 1/T
B. decreases in proportion to 1/T2
C. increases in proportion to T
D. increases in proportion to T2
E. does not change
Answer: C. increases in proportion to T
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Radioactive Decay: The atom 40K decays radioactively to the gas 40Ar. An ancient rock is found to contain enough 40Ar gas to indicate that 77.0% of the 40K in the rock has decayed to 40Ar since the rock solidified. (Any previous argon would have boiled out of liquid rock.) How long ago did the rock solidify? The half-life of 40K is 1.25 billion years.
A. 2.65 billion years B. 0.471 billion years C. 1.80 billion years D. 0.324 billion years
It took two centuries for the Copernican model to replace the Ptolemaic model because:
A) in Copernicus' time, there were no telescopes. B) the Church wouldn't let anyone talk about Copernicus' model for 200 years. C) there was no scientific evidence to support either model until Galileo made his observations. D) the Ptolemaic model was simpler and more aesthetically pleasing. E) the Copernican model required complicated new terms to explain it correctly.
A 420-turn circular coil with an area of 0.0650 m2 is mounted on a rotating frame, which turns at a rate of 22.3 rad/s in the presence of a 0.0550-T uniform magnetic field that is perpendicular to the axis of rotation. What is the instantaneous emf in the coil at the moment that the normal to its plane is perpendicular to the field?
a. 33.5 V b. zero c. 0.0673 V d. 747 V e. 1.50 V
The pair of protons in the nucleus of a helium atom
A) attracts a pair of orbiting electrons. B) repels orbiting electrons. C) both of these D) neither of these