a pebble drops straight down into a tub of water, setting off ________ waves that travel at the boundary between the water and air.

Respuesta :

A pebble drops straight down into a tub of water, setting off surface waves that travel...

Answer: The correct answer is "surface wave".

Explanation:

There are three types of the mechanical wave: Longitudinal wave, Transverse wave and Surface wave.

Longitudinal wave: In this wave, the motion of the particles is parallel to the direction of the propagation of the wave. For example, sound wave.

Transverse wave: In this wave, the motion of the particles is perpendicular to the direction of the propagation of the wave. For example, light wave.

Surface wave: In this wave, the motion of the particles is neither parallel nor perpendicular to the motion of the wave. It moves in a circular motion.

Therefore, a pebble drops straight down into a tub of water, setting off  surface waves that travel at the boundary between the water and air.