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OpenStudy (anonymous):
The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. The microphone itself is placed on the focus of the parabola. If the parabola is 24 inches wide and 4 inches deep, how far from the vertex should the microphone be placed? (1 point) 4 inches 18 inches 9 inches 12 inches
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OpenStudy (anonymous):
@ganeshie8
ganeshie8 (ganeshie8):
|dw:1395438465272:dw|
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