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Chapter 16: Q.10 (page 451)
A wave has angular frequency 30 rad/s and wavelength 2.0 m.
What are its (a) wave number and (b) wave speed?
The wavenumber of the wave is 3.14 rad/m.
The wave speed is 9.55 m/s.
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An opera singer in a convertible sings a note at 600 Hz while cruising down the highway at 90 km/h. What is the frequency heard by a. A person standing beside the road in front of the car? b. A person on the ground behind the car?
A loudspeaker, mounted on a tall pole, is engineered to emit 75% of its sound energy into the forward hemisphere, 25% toward the back. You measure an 85 dB sound intensity level when standing 3.5 m in front of and 2.5 m below the speaker. What is the speaker鈥檚 power output?
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.
LASIK eye surgery uses pulses of laser light to shave off tissue
from the cornea, reshaping it. A typical LASIK laser emits a
1.0-mm-diameter laser beam with a wavelength of 193 nm. Each
laser pulse lasts 15 ns and contains 1.0 mJ of light energy.
a. What is the power of one laser pulse?
b. During the very brief time of the pulse, what is the intensity
of the light wave?
The sun emits electromagnetic waves with a power of 4.0 * 1026 W. Determine the intensity of electromagnetic waves from the sun just outside the atmospheres of Venus, the earth, and Mars.
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