can EM waves travel through a perfect vacuum? why?

Question

can EM waves travel through a perfect vacuum? why?

Answer 1

The answer is in Maxwell's Equations



In free space J=0 and B=μo H and D = εo E and ∇◦D = 0



Also ∇◦B = 0



∇x H = δD/δt where δ/δt denotes the partial derivative with respect to time.



∇x E = -δB/δt



Put all this together and then



Take the curl (∇x ) of both sides of the equations and apply the vector identity that for a vector V



∇x ∇x V = ∇∇◦V - ∇² V



You end up with the equations of propagation for the electric field, E, and the magnetic field, H.



It also gives the cool result that the velocity of propagation is 1/sqrt(μo εo) = 2.998x10^8 m/s

Answer 2

confident and no. Sound is a compression wave in a fabric. There ain't no textile in a suitable vacuum. Em waves trip precise with the aid of vacuum on the fee of sunshine.... that's why we are in a position to make sure the celebs.

Answer 3

Yes, em waves don't require air to travel, it is a property, like light. Light is an em wave. Air actually obstructs the em movement