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Chapter 16: Q. 30 (page 452)
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?
The phase at is .
The phase atis.
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A wave on a string is described by, where x is in m and t is in s.
a. In what direction is this wave traveling?
b. What are the wave speed, the frequency, and the wave number?
c. At t = 0.50 s, what is the displacement of the string at
x = 0.20 m?
Draw the history graph D(x = 4.0 m, t) at x = 4.0 m for the wave shown in FIGURE EX16
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?
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.
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