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Chapter 17: Q. 76 (page 487)
Two radio antennas are separated by 2.0 m. Both broadcast
identical 750 MHz waves. If you walk around the antennas in a
circle of radius 10 m, how many maxima will you detect?
The solution gives two radio antennas are separated by 2.0 m. Both broadcast
identical 750 MHz waves
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Scientists are testing a transparent material whose index of refraction for visible light varies with wavelength as n = 30.0 nm1/2 /l1/2, where l is in nm. If a 295-nm-thick coating is placed on glass 1n = 1.502 for what visible wavelengths will the reflected light have maximum constructive interference?
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 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?
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 44-cm-diameter water tank is filled with 35 cm of water. A 3.0-mm-diameter spigot at the very bottom of the tank is opened and water begins to flow out. The water falls into a 2.0-cm-diameter, 40-cm-tall glass cylinder. As the water falls and creates noise, resonance causes the column of air in the cylinder to produce a tone at the column鈥檚 fundamental frequency. What are (a) the frequency and (b) the rate at which the frequency is changing (Hz/s) when the cylinder has been filling for 4.0 s? You can assume that the height of the water in the tank does not appreciably change in 4.0 s.
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