A device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return is called?

The device that determines the presence and location of an object by measuring the time it takes for an echo of a radio wave to return is known as radar. Radar operates by emitting radio waves and detecting the echoes that reflect off of objects, such as aircraft or ships. The system calculates the distance to the object based on the time it takes for the radio waves to return after bouncing off the surface of the object. This technology is widely used in various fields, including aviation, maritime navigation, and meteorology, making it essential for tracking and identifying objects.

The other terms provided refer to different concepts. A carrier wave is a continuous wave that can be modulated to carry information, generally used in telecommunications. Trapping may refer to various concepts in physics or other fields but does not relate specifically to measuring distances with radio waves. Hertz is a unit of frequency, representing cycles per second, and is not a device used for locating objects. Therefore, radar is the correct choice as it directly correlates with the description given in the question.