Question

Would the speed of an EM wave be the same in air and in water? Defend your answer.

Answer 1

Answer

No speed will be not same in air and water

Explanation:

The speed of the EM wave is $3\times 10^{8}m/sec$ in air the speed of the EM wave depends on the relative permeability and relative permitivity of the medium

The speed of the EM wave is given by $c=\frac{1}{\sqrt{\mu _0\varepsilon _0}}$

As the value of $\mu _0$ and $\epsilon _0$ is different in different media so the speed of EM wave is also different in different media

So the velocity of EM wave will not be same in air and water

Answer 2

Answer:

Speed of an EM wave is different in air and in water.

Explanation:

The speed of an EM wave is different in air and water .

Since the frequency of any EM wave is its characteristic property, therefore wavelength and speed of EM wave Change on changing the medium of propogation.

Also the refractive index $(\mu)$ of any medium is defined as the ratio between light's speed in vacuum to the light's speed in any medium.

Also ,it can be define as speed of any EM wave in any medium = c/refractive index of medium.

Here, c is the speed of light, $c=3\times 10^{8} m/s$.