What is sonar

Sonar: True or False Activity This activity will help you assess your knowledge of the definition, examples, and applications of sonar. Directions Determine whether the following statements are true or false. To do this, print or copy this page on a blank paper and underline or circle the answer. True | False 1. Sound is a type of vibration that propagates through any medium, even in the vacuum of space. True | False 2. The deepest parts of the ocean floor can be mapped using sonar. True | False 3. Active radar is essentially used to detect sound pulses from marine objects, such as submarines and ships. True | False 4. The ping sent out by a submarine will travel downward and encounter obstructions, such as hills, valleys, and rocks True | False 5. Bats are nocturnal animals and rely on passive sonar, which allows them to navigate the dark and hunt prey. True | False 6. The noise emitted by ship engines and in other vessels can be detected via sonar. True | False 7. Dolphins can send out pings through their jaw and receive echoes with their sensitive forehead. True | False 8. An echo is defined as the reflected sound that is heard again by its initial observer. Answer Key • False, because the correct statement is: Sound is a type of vibration that propagates through any medium, except for the vacuum of space. • True • False, because the correct statement is: Passive sonar is essentially used to detect sound pulses from marine objects, such as submarines and ships. • True •...

HELLLOOO! LOOH. Looh. looh. If you have ever heard an echo, you’ll be familiar with the basic principle behind three similar technologies: radar, sonar and lidar. An echo is the reflection of sound waves off of some distant object. If you shout in a canyon, the sound waves travel through the air, bounce off the rocky walls and then come back to you. Sonar (SO-nahr) is the most similar to this scenario. This technology also relies on sound waves to detect objects. However, sonar is typically used underwater. This sonar image shows the entrance to Portsmouth Harbor, N.H. Lower areas are in blue, higher areas in red. NOAA/NOS/Office of Coast Survey Medical techniciansalsomay use sound waves to peer inside the human body (which is mostly water). Here, the technology is known as ultrasound. When bats, dolphins and other animals use sonar naturally, usually to find prey, it’s called echolocation (EK-oh-lo-CAY-shun). These animals send out a series of short sound pulses. Then they listen for the echoes to determine what’s in their environment. Radar and lidar (LY-dahr) rely on echoes, too. Only they don’t use sound waves. Instead, these two technologies use radio waves or light waves, respectively. Both are examples of Scientists made up the words radar, sonar and lidar. Each reflects a technology’s usefulness: · Radar: ra(dio) d(etection) a(nd) r(anging) · Sonar: so(und) na(vigation) (and) r(anging) · Lidar: li(ght) d(etection) a(nd) r(anging) Detection (or navigation) refers to...

What is an ultrasound? An ultrasound scan is a medical test that uses high-frequency sound waves to capture live images from the inside of your body. It’s also known as sonography. The technology is similar to that used by sonar and radar, which help the military detect planes and ships. An ultrasound allows your doctor to see problems with organs, vessels, and tissues without needing to make an incision. Unlike other imaging techniques, ultrasound uses no radiation. For this reason, it’s the preferred method for viewing a developing fetus during pregnancy. Most people associate ultrasound scans with pregnancy. These scans can provide an expectant mother with the first view of her unborn child. However, the test has many other uses. Your doctor may order an ultrasound if you’re having pain, swelling, or other symptoms that require an internal view of your organs. An ultrasound can provide a view of the: • bladder • brain (in infants) • eyes • gallbladder • kidneys • liver • ovaries • pancreas • spleen • thyroid • testicles • uterus • blood vessels An ultrasound is also a helpful way to guide surgeons’ movements during certain medical procedures, such as biopsies. The steps you will take to prepare for an ultrasound will depend on the area or organ that is being examined. Your doctor may tell you to fast for eight to 12 hours before your ultrasound, especially if your abdomen is being examined. Undigested food can block the sound waves, making it difficult for the technicia...