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.
Question 2
If y = 0.02 sin (30x - 400t) (SI units), the wave number is
a. 30 rad/m
b. 30/2p rad/m
c. 400/2p rad/m
d. 400 rad/m
e. 60p rad/m
Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken
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