Which type of wave has oscillations that are parallel to the direction of wave propagation?

• A. Transverse waves
• B. Surface waves
• C. Electromagnetic waves
• D. Longitudinal waves

Answer: (D)

Verified step by step guidance

1. Understand the difference between transverse and longitudinal waves: In transverse waves, the oscillations are perpendicular to the direction of wave propagation, while in longitudinal waves, the oscillations are parallel to the direction of wave propagation.
2. Recall that electromagnetic waves are transverse waves because their electric and magnetic fields oscillate perpendicular to the direction of wave travel.
3. Recognize that surface waves are a combination of transverse and longitudinal motions, typically occurring at the interface between two media, such as water and air.
4. Identify that longitudinal waves have oscillations (vibrations) that occur in the same direction as the wave travels, which is characteristic of sound waves in air.
5. Conclude that the wave type with oscillations parallel to the direction of propagation is the longitudinal wave.