QUESTION 4 a) Critically evaluate the various methods by which noise can be controlled. (10 marks) a) Calculate the atte

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Question 4 A Critically Evaluate The Various Methods By Which Noise Can Be Controlled 10 Marks A Calculate The Atte 1 (44.53 KiB) Viewed 37 times

QUESTION 4 a) Critically evaluate the various methods by which noise can be controlled. (10 marks) a) Calculate the attenuation due to a sound barrier which is 3.5m tall, and which is placed between a sound source and a receiver. The sound source is 0.5m above ground level, and the receiver is 1.2m above ground level. The horizontal distance between the sound source and the receiver is 7m, and the horizontal distance from the sound source to the barrier is 2m. Assume that the noise has a frequency of 1000Hz, and that the ground is flat. (10 marks) b) Comment on the effect of moving the sound barrier. (5 marks) Useful equations: Aurier = 10 log.. (3+100%) 8=a+b-c 28 NE -1 abe 2000 V 28 - K-expl i is the wavelength of the sound wavelength = velocity/frequency: Velocity of sound in air = 340m/s b 4 a с