military just before WW2.
Sonar was not introduced in World War 1.
Henry Hess did not invent sonar or radar. Sonar was first developed in the early 20th century by several scientists, including Lewis Nixon and Reginald Fessenden, while radar was independently developed by various scientists in the 1930s, such as Sir Robert Watson-Watt and his team in the UK.
Sonar
Sonar
RADAR - Radio Detection and Ranging SONAR - Sound Navigation and Ranging
Sonars were used to detect any objects that got into the detection field of the sonar. By this, the military could detect enemy submarines etc., which they couldn't see normally because of the opacity and/or darkness of the water.
Detecting and ranging (measuring the distance of) enemy craft in air (planes) and water (ships and subs).
lazors, GPS, radar, and sonar are all examples of things developed for war that are used today
Sonar, Lidar.
NO. We call that radar.
no, radar is used
Sonar uses sound waves to detect objects underwater, while radar uses radio waves to detect objects in the air or on the ground. Sonar is typically used in marine environments, while radar is commonly used in aviation and meteorology.