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Chapter 17: Q.41 (page 485)
A violinist places her finger so that the vibrating section of a 1.0 g/m string has a length of 30 cm, then she draws her bow across it. A listener nearby in a 20掳C room hears a note with a wavelength of 40 cm. What is the tension in the string?
The tension in the string is 265 N
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A sheet of glass is coated with a 500-nm-thick layer of oil 1n = 1.422.
a. For what visible wavelengths of light do the reflected waves interfere constructively?
b. For what visible wavelengths of light do the reflected waves interfere destructively?
c. What is the color of reflected light? What is the color of transmitted light?
Two loudspeakers in a room emit 686 Hz sound waves
along the x-axis.
a. If the speakers are in phase, what is the smallest distance between the speakers for which the interference of the sound
waves is maximum destructive?
b. If the speakers are out of phase, what is the smallest distance
between the speakers for which the interference of the sound
waves is maximum constructive?
FIGURE EX17.2 is a snapshot graph at t = 0 s of two waves approaching each other at 1.0 m/s. Draw six snapshot graphs, stacked vertically, showing the string at 1 s intervals from t = 1 s to t = 6 s.
A 25-cm-long wire with a linear density of 20 g/m passes across the open end of an 85-cm-long open-closed tube of air. If the wire, which is fixed at both ends, vibrates at its fundamental frequency, the sound wave it generates excites the second vibrational mode of the tube of air. What is the tension in the wire? Assume vsound = 340 m/s.
Two loudspeakers emit sound waves along the x-axis. A listener in front of both speakers hears a maximum sound intensity when speaker 2 is at the origin and speaker 1 is at x = 0.50 m. If speaker 1 is slowly moved forward, the sound intensity decreases and then increases, reaching another maximum when speaker 1 is at x = 0.90 m.
a. What is the frequency of the sound? Assume vsound = 340 m/s.
b. What is the phase difference between the speakers?
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