Room temperature is approximately
A) 68. K.
B) 300.°F.
C) 300. K.
D) 68.°C.
E) -68.°F.
C
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The sidereal drive of a telescope mounting must turn the telescope
a. southward about the polar axis. b. eastward about the polar axis. c. westward about the polar axis. d. northward about the polar axis. e. none of the above
A chamber that can be filled with different gases has placed in it a source of sound that in air produces a frequency of 200 Hz and a microphone to pick up the sound for frequency analysis. First the chamber is filled with helium (speed of sound 1 000 m/s at room conditions), then the helium is replaced with oxygen (speed of sound 330 m/s at room conditions), and then finally the helium is
replaced with carbon dioxide (speed of sound 269 m/s at room conditions). In which gas is the highest frequency of sound found by the microphone during this experiment? a. helium b. oxygen c. carbon dioxide d. They all have the same frequency of sound.
A totally eclipsed moon glows coppery red because
a. the moon' surface is made of iron ore which is red in color. b. red light is cooler than blue light. c. during a lunar eclipse the sun is cooler than normal and its light is more red. d. only red light is able to pass completely through Earth's atmosphere and reach the moon. e. the moon appears red during a total solar eclipse, not a total lunar eclipse.
In a parallel circuit, the size of the current flowing through each device may be different
a. True b. False Indicate whether the statement is true or false