Underwater illusion. One clue used by your brain to determine the direction of a source of sound is the time delay T between the arrival of the sound at the ear closer to the source and the arrival at the farther ear. Assume that the source is distant so a wavefront from it is approximately planar If it reaches you, and let D represent the separation between your ears. (a) If the source is located at angle u in front of you (Fig. 17-30), what is T in terms of D and the speed of sound V in air? (b) If you are submerged in water and the sound source is directly to your right, what is T in terms of D and the speed of sound VW in water? (c) Based on the Time-delay clue, your brain interprets the submerged sound to arrive at an angle u from the forward direction. Evaluate u for fresh water at 20 °c. ...
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