The type of wave used in sonar to detect objects is sound. Sonar stands for "Sound Navigation And Ranging" and it relies on the principle of sound waves traveling through a medium, such as water or air. Sonar systems emit sound waves into the water, which then bounce off objects and return to the system. By measuring the time it takes for the sound waves to travel and return, sonar can determine the distance and location of objects underwater.
The type of wave used in sonar to detect objects is sound waves.
