Chapter 17: Q9. (page 482)
FIGURE Q17.9 shows the circular waves emitted by two in-phase sources. Are a, b, and c points of maximum constructive interference, maximum destructive interference, or in between?
a: Maximum Constructive interference
b: In between.
c: Maximum Destructive interference
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What are the three longest wavelengths for standing sound waves in a 121-cm-long tube that is (a) open at both ends and (b) open at one end, closed at the other?
|| The three identical loudspeakers
in FIGURE P17.71 play a 170 Hz tone
in a room where the speed of sound
is 340 m/s. You are standing 4.0 m
in front of the middle speaker. At
this point, the amplitude of the wave
from each speaker is a.
a. What is the amplitude at this
point?
b. How far must speaker 2 be moved
to the left to produce a maximum
amplitude at the point where you
are standing?
c. When the amplitude is maximum,
by what factor is the sound intensity
greater than the sound intensity from a single speaker?
An open-open organ pipe is 78.0 cm long. An open-closed pipe has a fundamental frequency equal to the third harmonic of the open-open pipe. How long is the open-closed pipe?
A longitudinal standing wave can be created in a long, thin aluminum rod by stroking the rod with very dry fingers. This is often done as a physics demonstration, creating a high-pitched, very annoying whine. From a wave perspective, the standing wave is equivalent to a sound standing wave in an open-open tube. As FIGURE EX17.21 shows, both ends of the rod are antinodes. What is the fundamental frequency of a 2.0-m-long aluminum rod?
A bass clarinet can be modeled as a 120-cm-long open-closed tube. A bass clarinet player starts playing in a 20°C room, but soon the air inside the clarinet warms to where the speed of sound is 352 m/s. Does the fundamental frequency increase or decrease? By how much?
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