Sound waves can reflect off surfaces ... This technique is applied in sonar systems used to measure the depth of the seabed and to find shipwrecks, submarines and shoals of fish.

They cause particles to vibrate parallel to the direction of wave travel. The vibrations can travel through solids, liquids or gases. When travelling through air, the speed of sound is about 340 m/s.

You can't, right? Well, not with your eyes. But you can "see" with sound waves. See how it works below, then find out what sonar is used for.

The device makes sound waves scatter around an object making it invisible to sonar detection. In order to achieve this, the researchers used a "smart" material with special properties. The ...

most often sound waves. While a well-known use of this is sonar, ultrasonic sensors can also be put to use to make a radar-like system. This ultrasonic radar project is from [mircemk] who uses a ...

Dima Hasao: The rescue operation, supported by Sonar equipment, is ongoing as water continues to flow into the mine, ...

Naval sonar systems work like acoustic floodlights, sending sound waves through ocean waters for tens or even hundreds of miles to disclose large objects in their path. But this activity entails ...

Curious mammals are attracted by sonar device – tech that emits sound waves READ MORE: Watch the moment an orca kills and ...

To make the detection more sensitive, researchers built the phased-array sonar system. This consists of multiple units that can transmit sound waves and those of different frequencies ...

These systems have been around for decades and use sound waves to detect underwater features and objects, but there are open questions “about why certain types of sonar would be particularly ...