Calculate the echo times for temperatures of 5.00ºc and 35.0ºc. (b) what percent uncertainty does this cause for the bat in locating the insect? (c) discuss the significance of this uncertainty and whether it could cause difficulties for the bat. (in practice, the bat continues to use sound as it closes in, eliminating most of any difficulties imposed by this and other effects, such as motion of the prey.)

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me