(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
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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please mainly solve the SOUND PRESSURE LEVEL,
Transcribed Image Text:(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 7.4x106 rayl, respectively. The intensity ratio of the reflected and incident waves
is given by:
Irepected _ (Z, - Z,
– z,}
reflected
Imcident (Z, + Z,}
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