Answers for Sound and Vibration exmples
Hope this help the students who study sound and vibration but don't have Chegg ID. Questions 1. What is the change in sound pressure level from a uniform radiating source, if (a) the intensity is doubled? (b) the pressure is doubled? (c) two more identical sources are added in locations equivalent to the first 2. Calculate the % of acoustical energy that must be removed to reduce a given SPL by 1dB; by 5dB; by 10dB 3. 80dB + 76dB = ? 4. You have available to you two pump styles : pump A at 80 l/s produces a 100 dBA SPL at a given point, and pump B at 40 l/s produces 90dBA under the same condition. From a noise control standpoint, what combination of pumps would be the most acceptable for developing a flow rate of 160 l/s? 5. The noise level from a power station with 10 identical transformers measured near some residential property line was found to be 54dB. The maximum permitted in this area is 51d
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