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Chapter 16: Q. 60 (page 453)
The string in FIGURE P16.60 has linear density . Find an expression in terms of M, , and for the speed of waves on the string.
Speed of the waves on the string is,
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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?
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?
Helium (density 0.18 kg/m3 at 0掳C and 1 atm pressure)
remains a gas until the extraordinarily low temperature of 4.2 K. What is the speed of sound in helium at 5 K?
Draw the snapshot graph D(x, t = 0 s) at t = 0 s for the wave shown in FIGURE EX16.6.
A loudspeaker on a tall pole broadcasts sound waves equally in all directions. What is the speaker鈥檚 power output if the sound intensity level is 90 dB at a distance of 20 m?
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