What do we call a small piece of solar system debris that has fallen to the surface of Earth?
A) Iridium
B) A comet
C) A meteor
D) A meteorite
E) A shooting star
D) A meteorite
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The percentage volume of unoccupied space in a material is called its
a. traction. b. porosity. c. permeability. d. salinity.
A stretched string is observed to have four equal segments in a standing wave driven at a frequency of 480 Hz. What driving frequency will set up a standing wave with five equal segments?
A) 240 Hz B) 600 Hz C) 360 Hz D) 120 Hz
Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere. b. shock waves move through the photosphere. c. the sun rotates differentially. d. the strong magnetic field inhibits the currents of hot gas rising from below. e. they radiate their energy into space faster than the rest of the photosphere.
When is the lens of the eye most curved?
A. When looking at near objects. B. When looking at distant objects C. It depends on the size of the object. D. This is not in this chapter.