Speed of thermal radiation is equal to

Options

A. the speed of light
B. less then speed of light
C. greater then speed of light
D. None of the above

Answer

To solve the question regarding the speed of thermal radiation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Thermal Radiation**:
- Thermal radiation refers to the electromagnetic radiation emitted by all objects based on their temperature. This includes infrared radiation, which is a significant part of thermal radiation.

2. **Identifying the Speed of Electromagnetic Waves**:
- All forms of electromagnetic radiation, including thermal radiation, travel at the same speed in a vacuum. This speed is known as the speed of light.

3. **Speed of Light**:
- The speed of light in a vacuum is approximately \(3 \times 10^8\) meters per second (m/s). This is a fundamental constant in physics.

4. **Conclusion**:
- Therefore, the speed of thermal radiation is equal to the speed of light in a vacuum.

### Final Answer:
The speed of thermal radiation is equal to the speed of light.

---