You're right to be confused! Your statement is not entirely accurate. Here's a breakdown of how the speed of light and sound differ in different mediums:

Light:

* Speed in Vacuum: Light travels fastest in a vacuum, at approximately 299,792,458 meters per second (approximately 186,282 miles per second). This is the speed of light in a true vacuum, like the space between stars.

* Speed in Mediums: Light travels slower in transparent mediums like water, glass, and air than in a vacuum. This is because the light interacts with the particles in the medium, causing it to slow down. The denser the medium, the slower the light travels.

Sound:

* Speed in Mediums: Sound needs a medium to travel, like air, water, or solids. The denser the medium, the faster sound travels.

* Why Sound is Faster in Solids: Sound travels fastest in solids because the particles in solids are packed tightly together. This allows vibrations to travel more quickly from one particle to the next.

Here's the key difference:

* Light: Light is an electromagnetic wave, meaning it doesn't need a medium to travel. Its speed is affected by the interaction with the medium's particles.

* Sound: Sound is a mechanical wave, meaning it needs a medium to travel. It travels faster in denser mediums because the particles are closer together, allowing vibrations to propagate quickly.

In summary:

* Light travels fastest in a vacuum and slower in denser mediums.

* Sound travels fastest in solids and slowest in gases.

Let me know if you have more questions!