The electromagnetic waves travel with

Options

A. the same speed in all media
B. the speed of light c = `3 xx 10^8 m s^(-1)` in free space
C. the speed of light c = `3 xx 10^8 m s^(-1)` in solid medium
D. the speed of light c = `3 xx 10^8 m s^(-1)` in fluid medium.

Explanation

To solve the question regarding the speed of electromagnetic waves, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Electromagnetic Waves**:
- Electromagnetic waves are waves that propagate through space and consist of oscillating electric and magnetic fields. They travel at a certain speed depending on the medium they are in.

2. **Speed of Electromagnetic Waves in Different Media**:
- The speed of electromagnetic waves is maximum in a vacuum. This speed is denoted by \( c \) and is approximately \( 3 \times 10^8 \) meters per second.

3. **Speed in Various Media**:
- In media such as solids and fluids, the speed of electromagnetic waves is less than \( c \). This is due to the presence of matter, which can interact with the electromagnetic waves, causing them to slow down.

4. **Conclusion**:
- Therefore, the statement that electromagnetic waves travel with the same speed in all media is incorrect. The maximum speed of \( 3 \times 10^8 \) m/s is only achieved in a vacuum.

5. **Correct Answer**:
- The correct option is that electromagnetic waves travel at the speed of light \( c = 3 \times 10^8 \) m/s in free space (vacuum), and this speed is not the same in solids or fluids.

### Final Answer:
The electromagnetic waves travel with a speed of \( c = 3 \times 10^8 \) m/s in free space (vacuum), and their speed is less in other media.

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