When the temperature of the air is 50°c, the velocity of a sound wave traveling through the air is approximately

a. 50 m/s.
b. 30 m/s.
c. 361 m/s.
d. 381 m/s.

which statement about this sum is true? −245+2.7

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