Air and Noise Pollution · Noise Pollution · 2 marks · Multiple choice
Consider:(i) sound pressure changes with distance from the source;(ii) sound power is a source property;(iii) sound intensity is sound power per unit volume. Which are correct?
Pressure depends on propagation and the observation location, whereas sound power describes source emission, so (i) and (ii) are correct. Intensity is power transmitted per unit area normal to propagation, in W/m²,not power per unit volume. Thus (iii) is false and **B** is correct.
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