Relative electric permittivity of a medium is 9 and relative permeability close to unity. What is the speed of em waves in the medium.

Explanation

To find the speed of electromagnetic (EM) waves in a medium with given relative electric permittivity and relative permeability, we can follow these steps:

### Step 1: Understand the formula for the speed of EM waves in a medium
The speed of EM waves in a medium can be calculated using the formula:
\[ v = \frac{c}{\sqrt{\epsilon_r \mu_r}} \]
where:
- \( v \) is the speed of EM waves in the medium,
- \( c \) is the speed of light in vacuum (approximately \( 3 \times 10^8 \, \text{m/s} \)),
...