Question

What do electromagnetic waves consist of? Explain what factors its velocity in vacuum depends on?

Answer 1

First of all we need to know how electromagnetic waves are formed. It forms when an electric field comes in contact with a magnetic field or we can say the electromagnetic waves are the combination of both electric field and magnetic field. Now writing the formula of electromagnetic wave velocity formula in value we can find the factors that depend on it.

Complete answer:
Electromagnetic waves consist of both electric and magnetic field waves. These are the waves that oscillate in perpendicular planes with respect to each other or we can say electric and magnetic fields are in an angle of $90^\circ$ and also they are in phase with each other.The creation of all these electromagnetic waves begins with an oscillating charge particle due to which it creates an oscillating electric and magnetic field.

The factors on which the velocity in vaccines depends on the permeability and permittivity of free space. And they are inversely proportional to the square root of permeability and permittivity of free space.Now by representing the above statement in mathematically form we will get,
$v = \dfrac{1}{{\sqrt {{\mu _0}{\varepsilon _0}} }}$
Where, the velocity in vacuum is $v$, Permeability in free space ${\mu _0}$ and permittivity of free space ${\varepsilon _0}$.

Note: Remember there are several uses of the electromagnetic waves. Radio wave is an electromagnetic wave that is used for communication such as television and radio. Keep in mind that radio waves are transmitted easily through the air which causes any damage if they are absorbed by the human body. Another important property of the radio waves is that they can reflect back to change their direction.