Here's a breakdown:
* Vibration: A back-and-forth motion, like a swinging pendulum.
* Particle: A tiny component of the medium (e.g., a molecule of air).
* Medium: The substance through which waves travel (e.g., air, water, a solid).
* Period: The time it takes for one complete cycle of vibration, meaning the particle returns to its starting position and is ready to repeat the cycle.
Example: Imagine a sound wave traveling through air. The air molecules are vibrating back and forth, and the time it takes for one molecule to complete a full vibration is the period of the wave.
