A stone is dropped on the surface of water in a pond. Name the type of waves produced.

State one observation from everyday life which shows that sound travels much more slow than light.

Name the two types of waves which can be generated in a long flexible spring (or slinky).

Name the type of wave produced when a tuning fork is struck in air.

What is the general name of the waves consisting of :

(a) compressions and rarefactions?

(b) crests and troughs?