1.   State an equation that links frequency and the period of a wave.

2.   Calculate the period of waves which have a frequency of 10 hertz.

3.   What is the period of water waves with a frequency of 0·25 hertz?

4.   Waves have a period of 0·2 seconds. Calculate their frequency.

5.   Waves a period of 0·01 seconds. Calculate their frequency.

6.   Ripples are produced on a ripple tank like the one shown opposite. Calculate the frequency when:

(a)        10 waves pass a point in 2 s;

(b)        18 waves pass a point in 6 s;

(c)        4 waves pass a point in 4 s;

(d)        100 waves pass a point in 20 s;

(e)        5 waves pass a point in 10 s.

7.   Look at the diagram s of waves below. From the information provided, find the frequency of the waves.