• Optical fibers are generally composed of silica, with an index of refraction around 1.44. How fast does light travel in a silica fiber?

You would need to take a picture so i can see

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.

The statement that best describes the object on the right is a bar magnet with its north pole on the left.