"If a tree falls in the forest, and no one is around to hear it, does it make a sound?" To answer that, we need to define, "What is sound?"
Definition of sound: "the sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium."
So, in other words, when a tree falls in the forest it sends out vibrations through the air. When those vibration reaches a hearing organ, it produces a sensation that we call sound. It takes to parts to make sound.
- A cause: When a tree falls it cause vibrations
- A transmitter: secondly, the cause needs something (the air) to transmit those vibrations over a distance.
- A Receiver: Lastly, for those vibrations to become sound, they need a receiver that will convert those vibrations into sound.
So, for the tree falling to make a sound, it needs all three parts. Consequently, if no one is around to be a receiver, then those vibrations are not converted to sound.