Which example shows that electromagnetic waves can travel without moving through a specific material (medium)?

A.
messages to and from a space craft and the earth

B.
microwaves through food

C.
gamma rays through the human body

D.
sound traveling through wood

Question

Which example shows that electromagnetic waves can travel without moving through a specific material (medium)?	
 
 A.
messages to and from a space craft and the earth
 
 B.
microwaves through food
 
 C.
gamma rays through the human body
 
 D.
sound traveling through wood

anonymous · Answer

In which example are the waves not travelling through any medium?Think about it.I'm pretty sure you must've heard that space is a vacuum, what is a vacuum?