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Chapter 11_solutions

# Chapter 11_solutions - Chapter 11 Waves Student 1 A sound...

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Student: ___________________________________________________________________________ 1. A sound source of 100 watts radiates sound uniformly in all directions. The intensity of the sound at a distance of 4.00 m is: A. 0.301 W/m 2 . B. 0.353 W/m 2 . C. 0.497 W/m 2 . D. 0.535 W/m 2 . E. 0.621 W/m 2 . Intensity: I=P/(4 R 2 ) = (100W)/(4 (4.00m) 2 ) = 0.497 W/m 2 4. A string is stretched with a tension of 120 N. The string has a mass of 10.0 grams and has a length of 2.50 meters. The velocity of wave propagation along the string is: A. 125 m/s. B. 142 m/s. C. 173 m/s. D. 185 m/s. E. 217 m/s. F v where F=tension and = linear mass density of string = mass/length = (0.01kg)/(2.50m) = 4x10 -3 kg/m. Then v = m kg N / 10 4 120 2 = 173 m/s. 10. A transverse wave travels at 250 m/s along the z-axis. If the frequency of the periodic vibrations of the wave is 440 Hz, then what is the wavelength of the wave? A. 21.9 cm

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Chapter 11_solutions - Chapter 11 Waves Student 1 A sound...

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