02-June-2008, 01:03 AM
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Senior Member
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Join Date: Nov 2002
Posts: 6,320
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Who knew 
Quote:
...Active sonar emits pulses of sound that travel through the water, reflect off an object and return as an echo to an underwater acoustic receiver. The echo is heard as a high-pitched whistle by the sonar operator and not as a "ping" as is commonly represented in Hollywood movies...
Star Bulletin
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