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Chapter 16: Q. 1 (page 450)
The three-wave pulses in FIGURE Q16.1 travel along the same stretched string. Rank in order, from largest to smallest, their wave speeds . Explain
The speed of a wave does not depend upon the wave amplitude. Hence, the wave speed is the same for all three cases.
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A spherical wave with a wavelength of 2.0 m is emitted from the origin. At one instant of time, the phase at r = 4.0 m is p rad. At that instant, what is the phase at r = 3.5 m and at r = 4.5 m?
A wave on a string is described by, where x is in m and t in s.
The linear density of the string is 5.00 g/m. What are
a. The string tension?
b. The maximum displacement of a point on the string?
c. The maximum speed of a point on the string?
You have just been pulled over for running a red light, and
the police officer has informed you that the fine will be \(250. In
desperation, you suddenly recall an idea that your physics professor recently discussed in class. In your calmest voice, you tell the officer that the laws of physics prevented you from knowing that the light was red. In fact, as you drove toward it, the light was Doppler shifted to where it appeared green to you. 鈥淥K,鈥� says the officer, 鈥淭hen I鈥檒l ticket you for speeding. The fine is \)1 for every 1 km/h over the posted speed limit of 50 km/h.< How big is your fine? Use 650 nm as the wavelength of red light and 540 nm as the wavelength of green light.
You are standing at x = 0 m, listening to a sound that is emitted at frequency . The graph of FIGURE Q16.12 shows the frequency you hear during a 4-second interval. Which of the following describes the sound source? Explain your choice.
A. It moves from left to right and passes you at t = 2 s.
B. It moves from right to left and passes you at t = 2 s.
C. It moves toward you but doesn鈥檛 reach you. It then reverses direction at t = 2 s.
D. It moves away from you until t = 2 s. It then reverses direction and moves toward you but doesn鈥檛 reach you
A wave has angular frequency 30 rad/s and wavelength 2.0 m.
What are its (a) wave number and (b) wave speed?
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