* Light is an electromagnetic wave, meaning it doesn't require a medium to travel. It can travel through the vacuum of space. Its speed in a vacuum is a constant, approximately 299,792,458 meters per second (often rounded to 300,000 km/s).
* Sound is a mechanical wave, meaning it needs a medium (like air, water, or solids) to travel. It's created by vibrations that cause particles in the medium to bump into each other. The speed of sound depends on the properties of the medium, most notably its temperature and density.
Here's why sound's speed changes with temperature:
* Molecular motion: As temperature increases, molecules in a medium move faster and collide more frequently. This increased movement allows sound vibrations to propagate faster through the medium.
* Density: Temperature also affects the density of a medium. As temperature rises, gases expand, becoming less dense. This can also influence the speed of sound.
In short:
* The speed of light is a constant, independent of the medium.
* The speed of sound is variable and depends on the temperature and density of the medium through which it travels.
