Question

Is it possible for one sound wave to cancel another?

Answer 1

It is indeed possible

Explanation:

If two sound waves of equal intensities and wavelength interfere with a path difference(`Deltax`) equal to `(2n-1)(lambda)/2` or phase difference(`Deltaphi`) equal to `(2n-1)pi` where `lambda` is wavelength and `n=1,2,3,4....` then the resultant intensity will be zero and hence the waves cancel each other out.