According to general relativity, a black hole is
A) an object that cannot be seen.
B) a hole in the observable universe.
C) a place where light travels slower than the normal speed of light.
D) a place where light travels faster than the normal speed of light.
E) a place where there is no gravity.
B
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From Kepler's ________ law, we conclude that the planets do not move with constant speed.
A. First B. Second C. Third D. Fourth
What is the function of the receiver antenna of a radio telescope?
a. To absorb the radio energy collected by the dish b. To collect and focus the radiation c. To follow a signal d. To move the telescope e. To control the shape of the dish
Convection currents in the air near a seashore are produced by
A) shifting winds. B) unequal heating of land and water. C) varying temperatures. D) none of the above
The background microwave radiation, discovered in 1965 by Penzias and Wilson, has its peak intensity at a wavelength of 1.06 mm
What blackbody temperature does this wavelength imply for the universe? (? = 5.670 × 10-8 W/m2 • K4, Wien displacement law constant is 2.90 × 10-3 m • K) A) 0.00°C B) 0.0027 K C) -2.7°C D) -270°C E) 2.7°C