When an object is reflected in a plane mirror, the image is always
A. Virtual
B. Real
C. Inverted
D. None of these
A. Virtual
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Astronomers can determine the interiors of main sequence stars by _____
a. studying their atmospheres b. creating stellar models c. detailed observations of the Sun d. using the Hertzsprung-Russell Stellar Model (HRSM) e. satellite observations of the closest stars
In order to double the average speed of the molecules in a given sample of gas, the temperature (measured in Kelvins) must
A) quadruple. B) reduce to one-fourth its original value. C) triple. D) double. E) reduce to one-half its original value.
Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
A) The higher density of gas has a stronger force of gravity, and therefore the cloud collapses more quickly. B) The thickness of the dense cloud prevents a disk from forming. C) The higher gas density forms stars more efficiently, so all the gas is converted into stars before a disk can form. D) The force of gravity can pull the material into a more spherical shape. E) The more frequent collisions between particles randomize the particle orbits.
A pencil partially submerged in a glass of water appears broken or offset because of
a. polarization. b. diffraction. c. interference. d. refraction.