A wave can be made at any magnitude of amplitude. Therefore, the smallest height needed to make a wave is at any height. The correct answer is option D
A wave is a disturbance which travels through a medium transferring energy from one point to another without causing any permanent displacement of the medium.
The height needed by a wave is its amplitude. We can define amplitude as the maximum displacement of wave from original position.
A wave can be made at any magnitude of amplitude. Therefore, the smallest height needed to make a wave is at any height.
The correct answer is option D
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