Answer:
Assuming that the sound wave reflected only once off the surface of the water and traveled straight back up to the person, we can calculate the distance between the person and the surface of the water in the well as follows:
Distance = (Speed of sound in air x Time)/2
Where the speed of sound in air is approximately 343 meters per second at standard temperature and pressure, and the time is 0.3 seconds.
Distance = (343 m/s x 0.3 s)/2
Where the speed of sound in air is approximately 343 meters per second at standard temperature and pressure, and the time is 0.3 seconds.
Distance = (343 m/s x 0.3 s)/2
Distance = 51.45 meters
Therefore, the distance between the person and the surface of the water in the well is approximately 51.45 meters.