If two sounds have exactly opposite wave patterns, meaning they are perfectly out of phase with each other, they would undergo a phenomenon called destructive interference. Destructive interference occurs when two waves with equal amplitudes and opposite phases meet and overlap. In this case, the positive peaks of one sound wave would align with the negative peaks of the other, and vice versa.
When two sound waves undergo destructive interference, they can cancel each other out, resulting in a reduction or complete elimination of the sound. This cancellation occurs because the peaks of one wave align with the troughs of the other, causing the waveforms to add up in a way that reduces the overall amplitude of the resulting waveform.
So, if two sounds with opposite wave patterns are played simultaneously, the result would be silence or a significant reduction in the perceived sound level. It's important to note that perfect destructive interference is rare in practice, as it requires precise alignment of frequencies, amplitudes, and phases. In real-world scenarios, there might be partial cancellation or interference effects that create a modified sound rather than complete silence.