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Chapter 17: Q. 25 (page 458)
What is the thinnest film of on glass that
produces a strong reflection for orange light with a wavelength of 600 nm?
The thinnest film should be of thick that produces reflection of orange light.
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Two loudspeakers in a plane, 5.0 m apart, are playing the same frequency. If you stand 12.0 m in front of the plane of the speakers, centered between them, you hear a sound of maximum intensity. As you walk parallel to the plane of the speakers, staying 12.0 m in front of them, you first hear a minimum of sound intensity when you are directly in front of one of the speakers. What is the frequency of the sound? Assume a sound speed of 340 m/s.
A flute filled with helium will, until the helium escapes, play notes at a much higher pitch than normal. Why?
A 2.0-m-long string vibrates at its second-harmonic frequency with a maximum amplitude of 2.0 cm. One end of the string is at x = 0 cm. Find the oscillation amplitude at x = 10, 20, 30, 40, and 50 cm.
The 40-cm-long tube of FIGURE P17.54 has a 40-cm-long insert
that can be pulled in and out. A vibrating tuning fork is held next to the
tube. As the insert is slowly pulled out, the sound from the tuning fork
creates standing waves in the tube when the total length L is 42.5 cm, 56.7 cm, and 70.9 cm. What is the frequency of the tuning fork? Assume vsound = 343 m/s.
FIGURE Q17.8 is a snapshot graph of two plane waves passing
through a region of space. Each wave has a 2.0 mm amplitude
and the same wavelength. What is the net displacement of the
medium at points a, b, and c?
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