Final answer:
Longitudinal is a longitudinal wave. Therefore, the correct option is 1.
Step-by-step explanation:
Longitudinal waves are waves in which the particles of the medium move parallel to the direction of the wave propagation. Sound waves are a common example of longitudinal waves, where air particles move back and forth in the same direction as the sound wave travels.
In contrast, transverse waves involve particle movement perpendicular to the direction of wave propagation, such as light waves or electromagnetic waves.
Longitudinal waves are characterized by compressions and rarefactions, where compressions are regions of high particle density, and rarefactions are regions of low particle density.
The oscillation of particles occurs along the same axis as the wave travels. This distinctive motion distinguishes longitudinal waves from transverse waves, where particles oscillate perpendicular to the direction of wave motion.
Understanding the nature of waves, whether longitudinal or transverse, is fundamental in various fields, including physics, acoustics, and seismology. Identifying the type of wave is crucial in analyzing its behavior and properties, and it lays the foundation for comprehending complex wave phenomena in different scientific disciplines.
Therefore, the correct option is 1.