The speed v of a wave with frequency f and wavelength λ is given by the formula:

The speed and the frequency of the sound wave are known. Isolate λ from the equation and substitute the values of v=330m/s and f=70,000Hz to find the wavelength of the sound waves:
![\begin{gathered} \lambda=(v)/(f) \\ =(330(m)/(s))/(70,000Hz) \\ =0.0047m \\ =0.47\operatorname{cm} \end{gathered}]()
Therefore, the wavelength of the sound wave is:
![0.47\operatorname{cm}]()