Sounds - how are they made?

Sounds are produced by vibrating objects. The sound travels as a wave in a straight path away from the source of the noise.

Sounds become softer, or fainter, the further away we are from the source. A good example is an aeroplane which is very loud when it is taking off at the airport, but can hardly be heard when it is flying high above our heads. 

Sound travels around corners by being reflected off other surfaces.

OK, keep that in your head while we travel through some questions...