3D LADAR builds a 3D view by sending and receiving laser signals and measuring the time it takes for the light to flash out and back.

• A. True
• B. False
• C. It uses sound waves
• D. It uses radio waves

Answer: (A)

3D LADAR uses laser light pulses and measures how long it takes for each pulse to travel to a surface and return. The round-trip time, multiplied by the speed of light and halved, gives the distance to that point. By scanning the beam across the scene (or using a detector array), many such distance measurements form a 3D point cloud or surface, creating a 3D view. This is why the statement is true: it relies on laser signals and time-of-flight, not sound or radio waves. Sound-based systems are SONAR, and radios use RADAR, which operate at much longer wavelengths.