Practice Problem 0412
A person shouts out “I love Physics” in a cave and hears an echo 4 seconds later “I love Physics
Physics Physics”. If the temperature of the air is 28 degrees Celsius, find the distance the person is
standing away from the wall that reflected the sound?
Note: Echo times have to be divided by 2 to determine the time it takes to for the sound wave to travel
in one direction
∆t=
=2 s
v= 332+0.6temp
v= 332+0.6(28)
v= 332+16.8
v= 348.8 m/s
∆d= v∆t
=348.8(2)
=697.6 m