A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second. b. decrease the tension on the hose and shake the end more times per second. c. increase the tension on the hose and shake the end fewer times per second. d. decrease the tension on the hose and shake the end fewer times per second. e. keep the tension and frequency the same but increase the length of the hose.
C
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According to observations, what type of galaxy was much more common when the universe was 2 billion years old?
A) elliptical galaxies B) spiral galaxies C) irregular galaxies D) We can't say, because we are living at a time when the universe is 14 billion years old, not 2 billion years.
In the photoelectric effect, the energies of the ejected electrons
A) are proportional to the speed of light. B) are proportional to the intensity of light. C) are proportional to the frequency of light. D) vary randomly.
When the reflection of an object is seen in a plane mirror, the distance from the mirror to the image depends on
a. the wavelength of light used for viewing. b. the distance from the object to the mirror. c. the distance of both the observer and the object to the mirror. d. the size of the object.
A standard unit
a. is the same in all systems of units. b. may not be fixed in value. c. is found only in the British system. d. is used for taking accurate measurements. e. is found only in the metric system.