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Answer questions 12-15
12. A source and receiver, each 3 feet off the ground, are separated by a distance of 20 feet. If a 7 foot tall barrier is placed at the midpoint between them, what is the Fresnel number at 1,000 Hz? a. 1.3 b. 2.7 c. 3.8 d. 4.2 e. 5.9 f. None of the above 13. A spherical wave at 1,000 Hz has a peak pressure amplitude of 0.04 Pa at a radius of 3 meters. What is the intensity of this wave in W/m2 at the measured distance? a. 5.4x108 b. 2.1x107 c. 4.8x10-7 d. 1.9x106 e. f. 4.3x10 None of the above 14. For the conditions listed in the previous problem, what is the total acoustic power in Watts? a. 4.9x106 b. 5.5x10 c. 2.2x10-4 d. 4.9x104 e. 5.8x104 f. None of the above 15. An expansion chamber/muffler has an area ratio of m-10. What is the maximum achievable transmission loss in dB? a. b. 10 c. 12 d. 14 e. 16 f. None of the above
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