In a neighborhood challenge to see who can climb a tree the fastest, you are ready to climb. Your friends have surrounded you in a circle as a cheering section; each individual alone would cause a sound intensity level of 80 dB at your location. If the actual sound level at your location is 87 dB, how many people are rooting for you?
Answer to relevant QuestionsA dog’s bark has a sound intensity level of 40 dB. (a) If two of the same dogs were barking, the intensity level is (1) less than 40 dB, (2) between 40 dB and 80 dB, (3) 80 dB. (b) What would be the intensity level? An office in an e-commerce company has fifty computers, which generate a sound intensity level of 40 dB (from the keyboards). The office manager tries to cut the noise to half as loud by removing twenty-five computers. Does ...The wave speed in a liquid is given by v = √B/p, where B is the bulk modulus of the liquid and is its density. Show that this equation is dimensionally correct. What about v = √Y/pfor a solid? (Y is Young’s modulus.) A fighter jet flies at a speed of Mach 1.5. (a) If the jet were to fly faster than Mach 1.5, the half-angle of the conical shock wave would (1) increase, (2) remain the same, (3) decrease. Why? (b) What is the half-angle ...The human ear canal is about 2.5 cm long. It is open at one end and closed at the other. (a) What is the fundamental frequency of the ear canal at 20 oC? (b) To what frequency is the ear most sensitive? (c) If a ...
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