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Chapter 17: Q3. (page 483)
FIGURE EX17.3a is a snapshot graph at t = 0 s of two waves approaching each other at 1.0 m/s. At what time was the snapshot graph in FIGURE EX17.3b taken?
At t = 3sec
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Ultrasound has many medical applications, one of which is to monitor fetal heartbeats by reflecting ultrasound off a fetus in the womb.
a. Consider an object moving at speed toward an at-rest source that is emitting sound waves of frequency . Show that the reflected wave (i.e., the echo) that returns to the source has a Doppler-shifted frequency
FIGURE Q17.3 shows the displacement of a standing sound wave in a 32-cm-long horizontal tube of air open at both ends. a. What mode (m-value) is this? b. Are the air molecules moving horizontally or vertically? Explain. c. At what distances from the left end of the tube do the molecules oscillate with maximum amplitude? d. At what distances from the left end of the tube does the air pressure oscillate with maximum amplitude?
A flutist assembles her flute in a room where the speed of
sound is 342 m/s. When she plays the note A, it is in perfect tune
with a 440 Hz tuning fork. After a few minutes, the air inside her
flute has warmed to where the speed of sound is 346 m/s.
a. How many beats per second will she hear if she now plays the
note A as the tuning fork is sounded?
Deep-sea divers often breathe a mixture of helium and oxygen to avoid getting the “bends” from breathing high-pressure nitrogen. The helium has the side effect of making the divers’ voices sound odd. Although your vocal tract can be roughly described as an open-closed tube, the way you hold your mouth and position your lips greatly affects the standing-wave frequencies of the vocal tract. This is what allows different vowels to sound different. The “ee” sound is made by shaping your vocal tract to have standing- wave frequencies at, normally, 270 Hz and 2300 Hz. What will these frequencies be for a helium-oxygen mixture in which the speed of sound at body temperature is 750 m/s? The speed of sound in air at body temperature is 350 m/s.
What is the thinnest film of on glass that
produces a strong reflection for orange light with a wavelength of 600 nm?
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