The frequency of the waves is 17.5 Hz, and their wavelength is 45cm. Recall the following reation between the frequency, the wavelength and the speed of a wave:
[tex]v=\lambda f[/tex]Substitute f=17.5Hz and λ=45cm to find the speed of the wave:
[tex]\begin{gathered} v=(45\operatorname{cm})(17.5Hz) \\ =787.5\frac{\operatorname{cm}}{s} \\ =7.875\frac{m}{s} \\ \approx7.9\frac{m}{s} \end{gathered}[/tex]Therefore, the speed of the waves is:
[tex]7.9\frac{m}{s}[/tex]