Aperson, with his ear to the ground, sees a huge stone strike the concrete pavement. a moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 0.90 s apart. the speed of sound in air is 343 m/s, and in concrete is 3000 m/s. how far away did the impact occur?

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?