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# An enclosed chamber with sound absorbing walls has a

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11) An enclosed chamber with sound absorbing walls has a 2.0 m x 1.0 m opening for an outside window. A loudspeaker is located outdoors, 30 m away and facing the window. The intensity level of the sound entering the window space from the loudspeaker is 51 dB. Assume the acoustic output of the loudspeaker is uniform in all directions and that acoustic energy incident upon the ground is completely absorbed. The acoustic output of the loudspeaker, in SI units, is closest to: A) 0.0071 B) 0.0028 C) 0.0014 D) 0.028 E) 0.014 12) A pipe, 10 m long and 10.0 cm in diameter contains olive oil. The density of the olive oil is 880 kg/m 3 and the bulk modulus is 1.2 x 10 9 Pa. A 800 Hz longitudinal wave is transmitted in the oil. The wavelength of the longitudinal wave, in the oil, in SI units, is closest to: 13) Which of the following is a WRONG statement 2

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14) A transverse wave is propagated in a string stretched along the x-axis. The equation of the wave, in SI units, is given by: y = 0.009 cos p (87t - 16x). The wave speed, including the sense of direction along the x-axis, in SI units, is closest to: 15) A wire, 5.0 m long, with a mass of 60 g, is under tension. A transverse wave is propagated on the wire, for which the frequency is 360 Hz, the wavelength is 0.90 m, and the amplitude is 2.7 mm. The tension in the line, in SI units, is closest to: A) 1800 B) 1300 C) 1600 D) 1400 E) 2000 16) A Carnot engine is operated as an air conditioner to cool a house in the summer. The air conditioner removes 19 kJ of heat per second from the house, and maintains the inside temperature at 293 K, while the outside temperature is 375 K. The power required for the air conditioner under these operating conditions, in SI units, is closest to: 17) Which of the following is a WRONG statement? Figure 20.4
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