Here's a breakdown:
* Sound is a mechanical wave: It requires a medium (like air, water, or solids) to travel. This means things like light, which travels as an electromagnetic wave, are not sound.
* Sound requires vibrations: These vibrations create pressure changes in the medium, which our ears detect as sound. Static electricity, for instance, doesn't produce vibrations in the air.
* Sound has a specific range of frequencies: Humans can hear a limited range, but other animals have different ranges. Ultrasound and infrasound exist beyond our hearing, but they are still forms of sound.
So, instead of "non-examples," here are things that aren't sound:
* Light: Travels as electromagnetic waves, not mechanical waves.
* Heat: Transfer of energy, not a vibration of a medium.
* Electromagnetism: Forces generated by charged particles, not mechanical vibrations.
* Radiation: Energy emitted from unstable atoms, not sound waves.
In essence, anything that doesn't involve vibrations traveling through a medium is not sound.
