Answer:
C. 0.02 Hz
Explanation:
The wavelength is 0.2 m and the period is 50 seconds because the period is the time that the wave takes to travel past you. Then, the frequency can be calculated as
f = 1/T
Where T is the period. Replacing T = 50 s, we get
f = 1/50
f = 0.02 Hz
Therefore, the frequency of the wave is
C. 0.02 Hz
