The results of Rutherford's experiment, in which alpha particles were fired toward thin metal foils, were surprising because .
A) two alpha particles emerged from the foil for every alpha that entered
B) some of the alpha particles were reflected almost straight backward
C) some alpha particles were destroyed in collisions with the foil
D) beta particles were created

option number c is the right answer.

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