Answer:
The period of this wave es 10 seconds.
Step-by-step explanation:
The wavelength is the minimum distance between two points of the wave that is in the same state of vibration.
Frequency is the number of vibrations that occur in a unit of time.
The speed of propagation is the speed with which the wave propagates in the middle. Relate wavelength (λ) and frequency (f) inversely proportionally using the following equation: v = f * λ.
The period is the time that elapses between the emission of two consecutive waves. In other words, it is the time it takes for a complete wave to pass through a reference point. The period (T) is simply the inverse of the frequency (f):

The units of the period are the seconds (s)
Then the propagation speed will be v = λ / T (Speed = wavelength/period)
Then T= λ / v

Period (T)= 10 s
The period of this wave es 10 seconds.