with pepellers
with pepellers
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Sound is a pressure wave. Objects that "allow" sound to travel through them could be called wave guides.
Yes, it is called radiation.
Refraction
Insulators- do not let heat through
They are called "hormones".
The material through which waves travel is called a medium. This could be a solid, liquid, or gas.
Galaxies that travel together through space are called galaxy groups or galaxy clusters. These are systems of galaxies bound together by gravity.
No. It is radiation, not vibration. As electromagnetic energy, it can travel through a vacuum, and only through transparent or translucent material.
There are many materials that light can not travel through which are called opaque objects.
By a process called "capillary" action.