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Learn about the history of sonar. ... Sonar is a system that uses transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distances underwater. It has been used for submarine and mine detection, depth detection, commercial fishing, diving safety and communication at sea.
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inventors.about.com/od/sstartinventions/a/sonar_history...
inventors.about.com/od/sstartinventions/a/sonar_history.htm
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Ask the experts your physics and astronomy questions, read answer archive, and more. ... Why isn't radar used underwater instead of sonar if radio waves are faster than sound waves? Asked by: Andrew Campbell ; Answer; Radar is short for ra(dio) d(etecting a(nd) r(anging).
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www.physlink.com/Education/AskExperts/ae456.cfm
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Resource: Sound Waves Underwater: Experiment with Sonar ... A sonar device emits one or more pulses of sound waves, which bounce off any objects they bump into and return to their source. A receiver collects the returning energy and records the time it took for the sound waves to make their round trips.
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www.teachersdomain.org/resource/phy03.sci.phys.mfw.sona...
www.teachersdomain.org/resource/phy03.sci.phys.mfw.sonar/
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Radar waves travel through air at the speed of light (~3.0x108 m/s) and sonar waves travel through water at the speed of sound (~1.5x103 m/s). Because of the relationship between velocity, frequency, and wavelength, the higher frequency radar and lower frequency sonar waves have similar wavelengths (Fig.
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www.soest.hawaii.edu/GG/HCV/NEWSV2N1/mackay1.html
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The French sub moves at 50.0 km/h, and the U.S. sub at 70.0 km/h. The French sub sends out a sonar signal (sound wave in water) at 1000 Hz. Sonar waves travel at 5470 km/h. a) What is the signal's frequency as detected by the U.S. sub?
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www.brainmass.com/homework-help/physics/classical-mecha...
www.brainmass.com/homework-help/physics/classical-mechanics/91471
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However, their reliance upon ultrasonic waves is not discussed as often, ... The sonar involved increases the pulse rate of the prey, as well as penetrating it, similar to x-rays used in medicine: the sonar of the dolphins also penetrates humans to display the skeleton just as it is able to penetrate through a pregnant...
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members.fortunecity.com/anemaw/dolphin.htm
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When air-waves prevented from impinging on exposed skin of blind/blindfolded, the subject could still detect obstacles by listening to footsteps. When hearing was eliminated and skin left exposed, objects could not be detected.
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members.fortunecity.com/anemaw/human.htm
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1 article on The effects of sonar waves on whales ... It seems that sonars may be harmful to both whales and dolphins. It is posing a possible threat to the world's entire whale and dolphin population. Research has shown that sonar waves can be heard by whales and dolphins.
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www.helium.com/knowledge/158251-the-effects-of-sonar-wa...
www.helium.com/knowledge/158251-the-effects-of-sonar-waves-on-whales
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Key Phrase page for sonar waves: Books containing the phrase sonar waves ... Featured Books for "sonar waves" ... Diagonal strips of color form sonar waves that traverse the sea, and green sea plants sway in the currents. Inspired by the thread paintings of Libby Lehman ... "
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amazon.com/phrase/sonar-waves
amazon.com/phrase/sonar-waves
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