Answer:
f=171.43Hz
Explanation:
Wave frequency is the number of waves that pass a fixed point in a given amount of time.
The frequency formula is: f=v÷λ, where v is the velocity and λ is the wavelength.
Then replacing with the data of the problem,
f=[tex]\frac{120\frac{m}{s} }{0.7m}[/tex]
f=171.43[tex]\frac{1}{s}[/tex]
f=171.43 Hz (because [tex]\frac{1}{s} = Hz[/tex], 1 hertz equals 1 wave passing a fixed point in 1 second).
