A perfect vacuum
Metals such as iron
Sound travels through mediums in sound waves.
This depends a lot on the type of waves you're talking about. Sound waves, for example, can travel through water, solid, and air mediums, but not through a vacuum. Electromagnetic waves, however, can travel in a vacuum.
Sound waves travel through the three states of matter (gas, liquid and solid) by vibrations.
Sound waves travel though mediums. Solids , liquids , and gas . It also travels though transverse and longitudinal. Also travel through the air......
It can travel through a solid, liquid, gas, and plasma
Waves travel faster in denser mediums. For example, sound travels faster in water than air.
Light waves travel at approx 300,000 kilometres per second, sound at approx 0.343 kilometres/second.Light waves can travel in vacuum or through some media (there is no such word as mediums!). Sound waves cannot travel through vacuum: they needs a physical medium.
Not all waves require mediums to propagate.Sound waves can travel through solid, liquid and gaseous mediums, while, electromagnetic waves do not require any medium to travel through.
It depends. Is it a mechanical wave or a electromagnetic wave? Mechanical waves (for example sound waves) travel trough every state of matter and they can't exist without matter. They don't travel through vacuum. Electromagnetic waves travel trough space and get interrupted only by other electromagnetic waves.