If four wave crests pass a pole each second:

1. What is the speed of the wave?

2. What is it's period?

1. The speed of the wave can be calculated using the formula:

s = number of waves / time

s = 4 waves / 1 s

s = 4 waves / s

2. The period is simply the reciprocal of the speed of the wave or:

P = time / number of waves

P = 1 s / 4 waves

P = 0.24 s/waves