On a bright winter's day, a student notices an echo as he jogs between a high...
On a bright winter's day, a coach notices an echo as she runs between a high school's playing field and the rear wall of its gym. She decides to estimate how far she stands from the reflective wall. She abruptly whistles and determines that the sound pulse returns to her as an echo 0.431 seconds later (averaging several trials for enhanced reliability). The air is a frigid -10°C. Six months later, the coach decides to repeat her experiment on a...