Answer: 60Hz
Explanation:
Given that
Speed of wave V= 54m/s
Wavelength ( λ) = 0.90 m
Frequency of wave F = ?
Recall that the frequency of a wave is the number of cycles the wave complete in one secon, and it is measured in hertz.
So, apply the formula
V = F λ
F = V/ λ
F = 54m/s / 0.90 m
F = 60Hz
Thus, the frequency of this wave is 60 Hertz