Intensity of Sound: You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to
A. one-half its original value.
B. one-fourth its original value.
C. one-sixteenth its original value.
D. None of these
Answer: B
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By comparing the two images, what can you conclude about Io's volcanoes?
A) Every black spot in the visible image has a bright spot in the infrared image, so all of Io's volcanoes were active when the photos were taken. B) There are more black spots in the visible image than bright spots in the infrared image, so many of Io's volcanoes were inactive when the photos were taken. C) There are more bright spots in the infrared image than black spots in the visible image, so new eruptions must have started after the visible photo was taken.
When a typical open cluster forms, which type of stars are formed most often?
A) solar type stars of class G B) OB associations C) red giants D) low mass M type dwarfs E) white dwarfs
A long wire lies in a tangle on the surface of a table, as shown below. When a current is run through the wire as shown, the largest component of the magnetic field at X points
a.
into the table.
b.
out of the table.
c.
parallel to the nearest segment of wire.
d.
antiparallel to the nearest segment of wire.
e.
along a circle which has its center at the center of the overall loop.
In deriving the axial electric field for the ring-shaped charge distribution and the electric field from a long line of charge, the component perpendicular to the resulting field is zero because of what physical property?
A) only net charge is important B) positive and negative charges cancel C) superposition D) integration E) symmetry