How does Lidar technology measure the speed of an object?

• A. By recording the distance of the object
• B. By measuring the time it takes for a pulse of laser light to reflect back
• C. By analyzing sound waves
• D. By calculating the object's mass and acceleration

Answer: (B)

Lidar technology measures the speed of an object by using laser light pulses. The method involves sending out a pulse of laser light towards the target object and then measuring the time it takes for that pulse to reflect off the object and return to the Lidar device. This time measurement, combined with the speed of light, allows the system to calculate the distance to the object very accurately.

To determine speed, Lidar systems often take multiple distance measurements over a brief period. By analyzing how the distance changes over time, the system can calculate the speed of the object. This technology is particularly effective for measuring the speed of moving vehicles, as it can provide rapid and precise measurements.

Other methods mentioned, such as analyzing sound waves or calculating mass and acceleration, do not pertain to how Lidar specifically functions, which is based solely on light and distance measurements.