A transverse wave and a longitudinal wave travelling in the same direction in a medium differ essentially in their

A transverse wave and a longitudinal wave traveling in the same direction in a medium differ essentially in their direction of vibration of the particles of the medium. In a transverse wave, the direction of vibration of the particles is perpendicular to the direction of wave propagation. This means that the particles move up and down as the wave moves forward. An example of a transverse wave is a wave on a string, such as a wave you might see in a flag flapping in the wind. In a longitudinal wave, the direction of vibration of the particles is parallel to the direction of wave propagation. This means that the particles move back and forth along the direction of wave propagation. An example of a longitudinal wave is a sound wave, where the particles of the medium are compressed and rarefied as the wave moves through the medium. The other two options, frequency and amplitude, describe different characteristics of a wave, but do not describe the essential difference between a transverse wave and a longitudinal wave.