1.1. A teacher demonstrates different types of wave.  

She uses a spring to demonstrate longitudinal waves.

(i) Draw arrows on the diagram to show the directions in which the teacher moves her hand.

(ii) Give an example of a longitudinal wave.

1.2. The teacher then demonstrates transverse waves.

 She fixes a vertical rod in a pond. She places a small wooden ring on the rod.

The ring floats on the water and moves up and down the rod as waves go past. 

(i) On the diagram, draw a line to show one wavelength.

   Label your line with the letter W.

(ii) The distance from P to Q is 5.0 cm.

   Determine the amplitude of the wave.

(iii) The wooden ring reaches point P every 15 s.

Calculate the frequency of the wave.

Give the unit. 

frequency = ....................... unit ...........

(iv) Explain how the movement of the wooden ring demonstrates that this wave is transverse.

(v) The wave shown is a water wave.

Give a different example of a transverse wave.