# Is it possible for one sound wave to cancel another?

If two sound waves of equal intensities and wavelength interfere with a path difference($\Delta x$) equal to $\left(2 n - 1\right) \frac{\lambda}{2}$ or phase difference($\Delta \phi$) equal to $\left(2 n - 1\right) \pi$ where $\lambda$ is wavelength and $n = 1 , 2 , 3 , 4. \ldots$ then the resultant intensity will be zero and hence the waves cancel each other out.