Final answer:
The statement is true as dropping a pebble into water creates a pulse wave, which is a single disturbance moving through a medium.
Step-by-step explanation:
The statement that a pebble dropped in water is an example of a pulse wave is true. When a pebble is dropped into the water, it creates a single disturbance that travels through the water. This disturbance is a pulse, which is a type of wave that consists of a single or few disturbances moving through a medium. Unlike continuous waves, which require an ongoing or repetitive motion, a pulse wave does not need continual excitation to propagate.
Pulse waves are characterized by their one-off nature; they are not continuous and do not repeat regularly over time. In the case of the pebble dropped into water, the pulse wave is the circular wave that spreads outward from the point of impact. It's created by the sudden displacement of water by the pebble, which then propagates through the water as a wavefront moving outward in a ring-shaped pattern.