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Quiz6 GGGGGGGG

# Quiz6 GGGGGGGG - Exam Name MULTIPLE CHOICE Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 660 - Hz tone has an intensity level of 54 dB. The velocity of sound in air is 345 m/s. The bulk modulus of air is 142 kPa. The pressure amplitude of the sound waves, in SI units, is closest to: A) 7.2 × 10 - 3 B) 1.4 × 10 - 2 C) 1.4 × 10 - 3 D) 2.9 × 10 - 3 E) 2.9 × 10 - 2 1) 2) A 380 - Hz tone has an intensity level of 64 dB. The velocity of sound in air is 345 m/s. The bulk modulus of air is 142 kPa. The displacement amplitude of the sound waves, in SI units, is closest to: A) 9.3 × 10 - 8 B) 2.3 × 10 - 7 C) 4.6 × 10 - 8 D) 9.3 × 10 - 7 E) 4.6 × 10 - 7 2) 3) A 860 - Hz tone has an intensity level of 71 dB. The velocity of sound in air is 345 m/s. The bulk modulus of air is 142 kPa. A 1548 - Hz tone has the same displacement amplitude as does the 860 - Hz tone. The difference in the intensity level of the 1548 - Hz tone relative to that of the 860 Hz tone, in dB, is closest to: A) - 5.1 B) 5.1 C) 2.6 D) - 2.6 E) zero 3) 4) A 710 - Hz tone has an intensity level of 23 dB. The velocity of sound in air is 345 m/s. The bulk modulus of air is 142 kPa. An 1122 - Hz tone has the same pressure amplitude as does the 710 - Hz tone. The difference in the intensity level, of the 1122 Hz tone relative to that of the 710 - Hz tone, in dB, is closest to: A) zero B) 2.0 C) 4.0 D) - 2.0 E) - 4.0 4) 5) The howler monkey is the loudest land animal and can be heard up to a distance of 5.0 km. Assume the acoustic output of a howler to be uniform in all directions. The acoustic power emitted by the howler, in mW, is closest to: A) 11 B) 0.11 C) 0.32 D) 1.1 E) 3.2 5) 6) The howler monkey is the loudest land animal and can be heard up to a distance of 8.0 km. Assume the acoustic output of a howler to be uniform in all directions. The distance at which the intensity level of a howler's call is 28 dB, in SI units, is closest to: A) 540 B) 380 C) 320 D) 480 E) 640 6) 1

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7) The howler monkey is the loudest land animal and can be heard up to a distance of 4.5 km. Assume the acoustic output of a howler to be uniform in all directions. A chorus of Fve howlers call at the same time. The largest distance at which the chorus can be heard, in km, is closest to: A) 18 B) 6.7 C) 10 D) 23 E) 14 7) 8) The howler monkey is the loudest land animal and can be heard up to a distance of 8.4 km. Assume the acoustic output of a howler to be uniform in all directions. A juvenile howler monkey has an acoustic output of 50 μ W. The ratio of the acoustic intensity produced by the juvenile howler to the reference intensity I o , at a distance of 460 m, is closest to: A) 19 B) 38 C) 28 D) 50 E) 13 8) 9) An enclosed chamber with sound absorbing walls has a 2.0 m × 1.0 m opening for an outside window. A loudspeaker is located outdoors, 74 m away and facing the window. The intensity level of the sound entering the window space from the loudspeaker is 24 dB. Assume
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Quiz6 GGGGGGGG - Exam Name MULTIPLE CHOICE Choose the one...

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