Molecular Speeds: An ideal gas is held in a container of volume V at pressure p. The rms speed of a gas molecule under these conditions is v. If now the volume and pressure are changed to 2V and 2p, the rms speed of a molecule will be
A. v/2.
B. v.
C. 2v.
D. 4v.
E. v/4.
Answer: C
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Process of Science: Explain the phrase used by Carl Sagan, "Extraordinary claims require extraordinary evidence."
What will be an ideal response?
Energy utilization appears to be
A) a sufficient condition, but not a necessary condition for life B) both a necessary condition and a sufficient condition for life C) neither a necessary condition nor a sufficient condition for life D) a necessary condition, but not a sufficient condition for life
When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. This pair production is an example of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
Two converging lenses, the first with focal length 10.0 cm and the second with focal length 20.0 cm, are separated by 40.0 cm. An object, 3.00 cm in height, is placed 30.0 cm in front of the first lens. Which of the following characteristics does the final image have?
A. real and upright B. real and inverted C. virtual and upright D. virtual and inverted E. none of these choices are correct