To find the speed (or velocity) of a wave, you can use the formula:
\[ v = f \cdot \lambda \]
where:
- \( v \) = speed of the wave (in meters per second, m/s)
- \( f \) = frequency of the wave (in hertz, Hz)
- \( \lambda \) = wavelength of the wave (in meters, m)
Given that the frequency \( f \) is 120 Hz and the wavelength \( \lambda \) is 5 m, you can substitute these values into the formula:
\[ v = 120 , \text{Hz} \cdot 5 , \text{m} \]
Now calculate the speed:
\[ v = 120 \cdot 5 = 600 , \text{m/s} \]
Therefore, the speed of the wave is \( 600 , \text{m/s} \).