Valley Width from Sound Echo · PhysicsBowl 2023 #24
Physics
Problem
An M-80 (BIG firecracker) is detonated in a valley formed between two parallel mountains. The first echo is heard 2.0 s after the detonation and the second echo is heard 2.0 s after the first one. What is the width of the valley?
a. 340 m
b. 740 m
c. 1080 m
d. 1360 m
e. 1700 m