A person clapped near the rock and he was heard echo after 4 seconds. So what is the distance of the rock from the person? (Speed of sound = 346m/s)

Answer: Option C

Let's break down this question step-by-step!

The key to understanding this problem is realizing that the sound has to travel to the rock AND back to the person for an echo to be heard.

We know the speed of sound is 346 meters per second.
We also know the total time for the sound to travel to the rock and back is 4 seconds.

To find the total distance the sound travels, we multiply the speed of sound by the total time: 346 m/s * 4 s = 1384 meters.

However, this 1384 meters is the distance to the rock AND back. We only want the distance to the rock.

Therefore, we need to divide the total distance by 2: 1384 meters / 2 = 692 meters.

So, the correct answer is Option C: 692 m. It represents the one-way distance from the person to the rock.