Question

Question 5
John is living on 2/F at building A, he always complaint about the traffic noise from the
highway nearby. John’s flat is approximately 6 m height and 12 m away a noise barrier.
The 3 m height noise barrier is installed at a distance of 6 m away vehicles, which
generates 78 dB(A) sound power level. Express the site condition in graphical format.
What is the magnitude of sound pressure level heard by John at 2/F?

Question 5 John is living on 2/F at building A, he always complaint about the traffic noise from the highway nearby. John's flat is approximately 6 m height and 12 m away a noise barrier. The 3 m height noise barrier is installed at a distance of 6 m away vehicles, which generates 78 dB(A) sound power level. Express the site condition in graphical format. What is the magnitude of sound pressure level heard by John at 2/F? (12 marks)

Answer 1

8PSE 3 m Vehicles 18.4 3 1 2 26.56 tane for noise baYYie Y 3 tan e= 8ニ 26. 56o Sin 3m Sin "26.560",= 3m V, 6.7Im tang for john1 house 6 tane R+6 = 18.43

Sing Sin C8u3) 18.97 19 L2 20 log - 78- 20 lo 8.6 69 d B