Final answer:
The period of a wave or vibration with a frequency of 20 Hz is 0.05 seconds, calculated using the relationship T = 1/f where T is period and f is frequency.
Step-by-step explanation:
The frequency of a wave is the number of complete wavelengths that pass a point in a given period of time, and it is measured in Hertz (Hz). As per the information provided, a frequency of 20 Hz means that 20 complete wave cycles pass a point every second. Using the relationship between frequency (f) and period (T), which is T = 1/f, we can calculate the period of the vibration.
The period T is the time it takes for one complete wave cycle to occur. Since the frequency of the wave you've mentioned is 20 Hz, its period T can be calculated as follows: T = 1/f = 1/20 Hz = 0.05 seconds. Therefore, the period of the wave or vibration with a frequency of 20 Hz is 0.05 seconds.