Water waves are known as what type of waves because the motion of the water is up and down, or at angles to the direction in which the waves are traveling?

Water waves are known as what type of waves because the motion of the water is up and down, or at angles to the direction in which the waves are traveling?

• A. Longitudinal
• B. Transverse
• C. Tidal
• D. Circular

Answer: (B)

The main idea is that a wave is classified by how the medium moves relative to the direction the wave travels. For water waves, the particles at or near the surface move mainly up and down as the wave passes, which is perpendicular to the direction the wave is moving along the surface. That perpendicular displacement is the defining feature of a transverse wave. Longitudinal waves would have the medium oscillating in the same direction as the wave travels, which isn’t how surface water waves behave. Tidal refers to gravitational effects and isn’t a wave type, and circular would imply the motion is in circular paths rather than simply perpendicular to the travel direction (though deep-water water waves do involve circular motion, the aspect highlighted in the question is the perpendicular displacement, i.e., transverse).

The main idea is that a wave is classified by how the medium moves relative to the direction the wave travels. For water waves, the particles at or near the surface move mainly up and down as the wave passes, which is perpendicular to the direction the wave is moving along the surface. That perpendicular displacement is the defining feature of a transverse wave.

Longitudinal waves would have the medium oscillating in the same direction as the wave travels, which isn’t how surface water waves behave. Tidal refers to gravitational effects and isn’t a wave type, and circular would imply the motion is in circular paths rather than simply perpendicular to the travel direction (though deep-water water waves do involve circular motion, the aspect highlighted in the question is the perpendicular displacement, i.e., transverse).