In a progressive wave, what is the phase difference (in degrees) between two points whose phases are opposite?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 180.
In a progressive wave, when two points are in opposite phase, it means they are at exactly counteracting positions in their oscillation. If one point is at its maximum positive displacement, the other is at its maximum negative displacement. This corresponds to a phase difference of 180 degrees (or π radians). Essentially, one point's motion is a mirror image of the other's, delayed or advanced by half a cycle.