Answer :
The reflecting wave flips upside-down on a stretched string when the wave moves from a less dense part of the rope moves toward a boundary that has a higher density. Hence the correct answer is (Option E).
What is a Reflecting Wave?
A reflecting wave is a wave that abruptly changes its propagation direction when it hits the boundary between two media.
An echo is a real-world example of a reflecting wave.
Learn more about Reflecting Waves at:
https://brainly.com/question/64516