(c) To evaluate the acoustic behaviour of a concrete wall, the propagation of a sound wave in air strikes on the wall at normal incidence. In this case, a little portion of acoustic energy can be transmitted through the concrete wall, and the rest portion is all reflected. Suppose that no energy loss occurs in other forms. The intensity level of the incident sound wave is 89.5 dB. Determine the sound intensity level and sound pressure level of the transmitted wave. It is given that the values of characteristic impedance for air and concrete are 410 rayl and 7.4x10 rayl, respectively. The intensity ratio of the reflected and incident waves is given by: Iepecnd _ (Zz – Z, Imcident (Z, + Z,} reflected

(c) To evaluate the acoustic behaviour of a concrete wall, the propagation of a sound wave in air strikes on the wall at normal incidence. In this case, a little portion of acoustic energy can be transmitted through the concrete wall, and the rest portion is all reflected. Suppose that no energy loss occurs in other forms. The intensity level of the incident sound wave is 89.5 dB. Determine the sound intensity level and sound pressure level of the transmitted wave. It is given that the values of characteristic impedance for air and concrete are 410 rayl and 7.4x10 rayl, respectively. The intensity ratio of the reflected and incident waves is given by: Iepecnd _ (Zz – Z, Imcident (Z, + Z,} reflected

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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