The electromagnetic waves

Options

A. travel with the speed of sound
B. travel with the same speed in all media
C. travel in free space with the speed of light
D. do not travel through a medium

Explanation

To solve the question regarding electromagnetic waves, we need to analyze each statement provided and determine its validity based on our understanding of electromagnetic waves.

### Step-by-Step Solution:

1. **Understanding Electromagnetic Waves**:
- Electromagnetic waves include a broad spectrum of waves, including visible light, radio waves, microwaves, etc. They are characterized by oscillating electric and magnetic fields and can travel through a vacuum.

2. **Speed of Electromagnetic Waves**:
- The speed of electromagnetic waves in a vacuum is approximately \(3 \times 10^8\) m/s (the speed of light). This is significantly faster than the speed of sound, which is about 343 m/s in air.

3. **Analyzing the Statements**:
- **Statement 1**: "The electromagnetic waves travel with the speed of sound."
- **Analysis**: This statement is incorrect because electromagnetic waves travel much faster than sound waves.

- **Statement 2**: "Travel with the same speed in all media."
- **Analysis**: This statement is also incorrect. The speed of electromagnetic waves changes depending on the medium they are traveling through (e.g., they travel slower in glass than in air).

- **Statement 3**: "Travel in free space with the speed of light."
- **Analysis**: This statement is correct. In a vacuum (free space), electromagnetic waves travel at the speed of light, which is \(3 \times 10^8\) m/s.

- **Statement 4**: "Do not travel through a medium."
- **Analysis**: This statement is incorrect. Electromagnetic waves can travel through various media, such as air, glass, and water.

4. **Conclusion**:
- The only correct statement regarding electromagnetic waves is that they "travel in free space with the speed of light."

### Final Answer:
The correct statement about electromagnetic waves is: **"Travel in free space with the speed of light."**