To find the frequency of a wave, we can use the wave equation:
\[ v = f \lambda \]
Where:
- \(v\) is the speed of the wave (60 m/s),
- \(f\) is the frequency (which we want to find),
- \(\lambda\) is the wavelength (1.2 m).
We can rearrange the equation to solve for frequency (\(f\)):
\[ f = \frac{v}{\lambda} \]
Now, plugging in the values:
\[ f = \frac{60 , \text{m/s}}{1.2 , \text{m}} = 50 , \text{hertz} \]
Thus, the frequency of the wave is:
C. 50 hertz.