An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?
a. 110 Hz, 220 Hz, 330 Hz
b. 220 Hz, 440 Hz, 660 Hz
c. 110 Hz, 330 Hz, 550 Hz
d. 330 Hz, 440 Hz, 550 Hz
e. 220 Hz, 660 Hz, 1 100 Hz
c
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The spectral lines are more distinct when viewed in a mercury vapor lamp under
A) high pressure. B) low pressure. C) same for each
Two cars that have the same mass are moving around a circular track at the same constant speed. The track is perfectly level. If car 1 is at the inner edge of the track and car 2 is at the outer edge, then
A. the frictional force on car 1 is greater than the frictional force on car 2. B. the frictional force on car 1 is less than the frictional force on car 2. C. the frictional force on both cars is zero. D. the frictional forces on both cars are equal and greater than zero.
Toronto, Canada and Santiago, Chile have similar longitudes but very different latitudes. Which of the following is true about how observers in those cities will view the constellation Orion, which is located approximately on the celestial equator?
A) Orion will cross the meridian at about the same local time in both cities, but at different altitude and direction. B) Orion will cross the meridian at the same altitude and direction in both cities, but at different local times. C) Orion will cross the meridian at the same altitude and direction and at about the same local time in both cities. D) If Orion is visible in the night sky in one city, then the other city will need to wait a few months to see Orion in its night sky.
The density of a column of air decreases as altitude increases because
A. Air contracts as pressure decreases B. Air expands as pressure decreases C. Nonsense, the density of air is constant. D. Nonsense, the density of air increases as altitude increases.