Which of the following best describes 'speed' as per the equation s=d/t?

Speed is defined as the rate at which an object covers distance. This can be mathematically represented by the equation s = d/t, where 's' stands for speed, 'd' represents distance traveled, and 't' indicates the time taken to cover that distance. In this context, speed is describing how much distance is covered per unit of time, effectively showcasing how quickly an object moves.

The correct option highlights that speed is fundamentally about the relationship between distance and time. It expresses that for every increment of time that passes, a certain amount of distance is traversed. This concept is critical in various applications, particularly in both RADAR and LIDAR technologies where understanding the speed of targets is essential for effective measurement and object tracking.

Other options do not accurately capture the essence of what speed represents in this equation. For example, the idea of a ratio of time to distance describes a different concept, while total distance divided by total amplitude mixes principles that are not directly related to speed. Similarly, measuring signal intensity over distance pertains more to signal strength rather than motion, making them unrelated to the definition of speed in this context.