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Chapter 16: Q. 3 (page 451)
A 25 g string is under 20 N of tension. A pulse travels the length of the string in 50 ms. How long is the string?
The length of the string is 2 meters
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Cell phone conversations are transmitted by high-frequency radio waves. Suppose the signal has wavelength 35 cm while traveling through air. What are the (a) frequency and (b) wavelength as the signal travels through 3-mm-thick window glass into your room?
A 440 Hz sound wave in 20掳C air propagates into the water of a swimming pool. What are the wave鈥檚 (a) frequency and (b) wavelength in the water?
Show that the displacement , where c and d are constants, is a solution to the wave equation. Then find an expression in terms of c and d for the wave speed.
A concert loudspeaker suspended high above the ground emits 35 W of sound power. A small microphone with a 1.0 cm2 area is 50 m from the speaker. a. What is the sound intensity at the position of the microphone? b. How much sound energy impinges on the microphone each second?
One cue your hearing system uses to localize a sound (i.e., to
tell where a sound is coming from) is the slight difference in the
arrival times of the sound at your ears. Your ears are spaced
approximately 20 cm apart. Consider a sound source 5.0 m from
the center of your head along a line 45 to your right. What is the
difference in arrival times? Give your answer in microseconds.
Hint: You are looking for the difference between two numbers that are nearly the same. What does this near equality imply about the necessary precision during intermediate stages of the calculation?
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