Homework 4 Acoustics I due date: November 26 2007 The figure shown below shows a typical sound power measurement setup in semi-anechoic chamber (all five surfaces of the room are anechoic, while the floor is rigid. In the figure, Q above the rigid surface is the actual sound source idealized as an acoustic monopole, Q below the rigid surface is the image source of the former. Q Q h r1r2R h A B θ(1)Show that the rigid surface condition (particle velocity normal to the surface = 0) is satisfied automatically by considering an image source as shown above.
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