A wave has a period of 0.25 seconds. What is the frequency of this wave?

The frequency of a wave is the reciprocal of the period. So, to find the frequency, you simply divide 1 by the period of the wave.

Step 1: Identify the period of the wave. In this case, the period is 0.25 seconds.

Step 2: Calculate the frequency by taking the reciprocal of the period. The formula for this is:

Frequency = 1 / Period

Step 3: Substitute the given period into the formula:

Frequency = 1 / 0.25 = 4 Hz

So, the frequency of the wave is 4 Hz.