Longitudinal wave no 4 has the greatest amplitude. The highest point of the wave is known as amplitude.
What is a longitudinal wave?
A longitudinal wave is a wave that is transversing along the length. When the displacement of medium and travel of wave is the same in that condition wave is known as the longitudinal wave.
It requires some medium to travel. A mechanical and sound wave is an example of a longitudinal wave.
In diagram 4 the particle of gas is arranged in such a that the particle will attain the position where the amplitude of the longitudinal wave is highest.
Hence Longitudinal wave no 4 has the greatest amplitude.
To learn more about the longitudinal wave refer to the link;
https://brainly.com/question/8497711
