They must in phase and must have at least approximately the same frequency.
If the two waves are in phase and have the same frequency, then they will have continuous constructive interference.
If the two waves have different, but similar, frequencies then they will alternate between constructive and destructive interference.
louder
"higher amplitude"
the amplitudes add together
constructively apex
they are to be shaped relatively close and the crest and trough need to be almost touching (or really close)
Interference of sound waves occurs when one sound wave is not in phase with another. Graphically, this means that the sin/cos function representing the second wave does not line up exactly with the first one and the differences in sounds that result interfere with each other.
They can't interfere.
If two sound waves are close in frequency,they can combine so that they interfere both constructivly and constructively at regular intervals the intervals depend on the difference between the two frequencies The repeated changes in loudness are called beats.:)
Two waves of equal magnitude but opposite phase interfere with one another to cause the waves to disappear. This is caused by
antinodes apex
they bounce im blood crips die
They can combine constructively or destructively, depending on their phase.