Which of the following is an example of ordinary (baryonic) matter?
A) you
B) photons of light
C) electrons and positrons produced by pair production
D) weakly interacting massive particles (WIMPs)
E) neutrinos
A) you
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Convection is a mode of energy transport between materials that requires close contact between the atoms
Indicate whether the statement is true or false
In a swell, wavelength is constant. As a swell nears the shore and touches bottom, the wavelength
A) shortens, wave speed slows, and wave height increases. B) shortens, wave speed slows, and wave height decreases. C) and wave height increase as wave speed slows. D) and wave height increase as wave speed quickens.
What is the current dominant geological process on Mars?
a. plate tectonics b. volcanism c. wind erosion d. water erosion e. cratering
Why do scientists think the Cassini spacecraft did not observe "spokes" on the rings during the first year of its visit with Saturn?
A) The "spokes" observed before were a phenomenon of the Voyager 2 camera. B) The "spokes" are not a regular phenomenon of Saturn's rings. They occur only in certain seasons. C) The "spokes" are related to Saturn's magnetic field and the Cassini spacecraft was located inside Saturn's magnetic field, while Voyager 2 was not. D) The Cassini spacecraft was not looking in the right part of Saturn's ring system to see the "spokes". E) To see the "spokes," a particular alignment of the rings with the Sun is necessary and it took one year for that alignment to reoccur.