What type of waves are illustrated by the movement of a rope whose one end is fixed to a pole and the other end is moved up and down?

What is the general name of the waves consisting of :

(a) compressions and rarefactions?

(b) crests and troughs?

State the general name of the waves on which the particles of the medium vibrate:

(i) in the same direction as wave.

(ii) at right angles to the direction of wave.

What should an object do to produce sound?

What is the name of the strings which vibrate in our voice box when we talk?