Final answer:
The frequency of a wave with a period of .25 s is 4 Hz.
Step-by-step explanation:
The frequency of a wave with a period of .25 s can be calculated using the formula:
f = 1/T
Where:
f is the frequency
T is the period
Substituting the given period value:
f = 1/0.25 = 4 Hz
Therefore, the frequency of the wave is 4 Hz.