GENERAL KNOWLEDGE

Detailed explanation-1: -Destructive interference occurs when the crests of one wave overlap the troughs of the other wave, causing a decrease in wave amplitude. When waves are reflected straight back from an obstacle, the reflected waves interfere with the original waves and create standing waves.

Detailed explanation-2: -Destructive interference occurs where two waves are completely out of phase (a peak lies at the midpoint of two waves. In other words, when two waves are out-phase phase by 180 degrees or radians, they interfere destructively and cancel each other out.

Detailed explanation-3: -However, if the crests of one wave align with the troughs of the other wave, they either form a smaller wave or cancel each other out completely. This is called destructive interference.

Detailed explanation-4: -Destructive interference happens when two waves overlap in such a way that they cancel each other out. Wave interference also depends on the relative phase of the two waves, as this video shows through the examples of path length differences and pi shifts.