Properties of EM Waves: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Properties of EM Waves. Understanding the underlying formula is key to arriving at the correct answer below:

The velocity of light in a medium is given by $v = \frac{1}{\sqrt{\mu \epsilon}} = \frac{1}{\sqrt{\mu_0 \mu_r \epsilon_0 \epsilon_r}}$ . Since the speed of light in vacuum is $c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}$ , we get $v = \frac{c}{\sqrt{\epsilon_r \mu_r}}$ .