They used the sun, the stars. hope this helps you.
Before sonar, the US used various acoustic detection methods, such as hydrophones and listening devices, to detect underwater objects and submarines. These methods relied on the amplification and interpretation of sound waves in water. Additionally, the US Navy also used other methods like visual observation and radar for above-water detection.
Enemy submarines, German U-boats had to stay on the surface most of the time due to the use of sonar. This made it easier to spot the U-boats, especially during daytime.
Sonar was not introduced in World War 1.
Not used in WWI, it was designed as a part of Manhattan Project and used on submarines and other vessels during WWII.
yes
In 1915, Paul Langévin invented the first sonar type device for detecting submarines called an "echo location to detect submarines" using the piezoelectric properties of the quartz. He was too late to help very much with the war effort, however, Langévin's work heavily influenced future sonar designs. The first Sonar devices were passive listening devices - no signals were sent out. By 1918, both Britain and the U.S had built active systems, in active Sonar signals are both sent out and then received back. Acoustic communication systems are Sonar devices where there is both a sound wave projector and receiver on both sides of the signal path. The invention of the acoustic transducer and efficient acoustic projectors made more advanced forms of Sonar possible.
No, the Arctic fox does not use sonar. It is not equipped with sonar.
Do boats use sonar. Yes they do.
they use SONAR. :)
We can use sonar to map the lake's floor.
Scientsts use sonar to map the depth of water in sea and river etc..,they also use sonar to locate and identify object underwater
Exactly the same. Sonar is Sound. We use the word sonar to indicate what use that the sound is put to- not to differentiate it from sound its self.
Scuba Divers use a Sonar to find treasure or a hidden ship.
Sonar
dogs do not use sonar. but if you mean ecolocation then no as well. but they do have incrediablely sensitive nose.
Many species of sharks do not use sonar, as they have very effective senses, but some species are thought to. The hammerhead shark, in particular, is thought to use sonar waves detection.
Sonar mapping is needed for ocean research patterns.
no