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Nothing. Electromagnetic radiation (waves) can travel through a vacuum. Which is why they radiate from the Sun to Earth. They can travel through a medium to varying extents, but they need nothing to travel, other than being propagated (started) in the first place.
For lower frequencies (e.g. radio through microwave) they can be blocked by metal and other good conductors, for higher frequencies (e.g. infrared through ultraviolet) they can be blocked by most solids and liquids, for x-rays they can only be blocked by very dense materials (e.g. bone, lead), and for gamma ray nothing can block them.
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Do electromagnetic waves need molecules to travel?
No, electromagnetic waves do not need matter to travel. However, they can interact with matter and change accordingly.
What do electromagnetic waves need to travel?
Electromagnetic waves don't need anything to travel. This kind of waves does not need a medium to move through, therefore they can even travel through outer space.
How mechanical and electromagnetic wave are different?
The biggest difference is that mechanical waves require a medium to travel through and electromagnetic waves do not.
What are the properties of electromagnetic waves?
speedwavelengthfrequencypolarization
How mechanical and electromagnetic waves are similar.?
Electromagnetic waves can travel through space.Mechanical waves need matter to transfer energy.
Why can electromagnetic waves travel through space and not sound waves?
Sound waves need a physical material to carry them, but electromagnetic waves don't.
Does a electromagnetic wave need a medium to travel?
Electromagnetic waves do not need a medium in which to travel. They move "best" through a perfect vacuum.
Can electromagnetic waves travel without a medium?
They do not need a medium.
What kind of energy does not need medium to travel?
electromagnetic waves
Sound is not part of the electromagnetic spectrum because?
because sound waves are not a electromagnetic waves because they need a medium for travel....hence electromagnetic spectrum is based on the electromagnetic waves ..like radio waves , micro waves , etc....
What Waves that can travel through a vacuum?
Electromagnetic waves.
Does waves need a medium to travel through?
No. Electromagnetic waves travel through vacuum ( ie space where there is nothing)
