Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because

Options

A. speed of sound is greater than speed of light
B. speed of sound is equal to the speed of light
C. speed of light is much greater than the speed of sound
D. none of these.

Explanation

To understand why we see the flash of lightning before we hear the thunder, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Phenomenon**:
- When lightning strikes, it produces both light (the flash) and sound (the thunder) simultaneously.

2. **Speed of Light vs. Speed of Sound**:
- The speed of light in air is approximately \(3 \times 10^8\) meters per second.
- The speed of sound in air is approximately \(300\) meters per second.

3. **Comparing the Speeds**:
- The speed of light is significantly faster than the speed of sound. In fact, the speed of light is about \(10^6\) times greater than the speed of sound.

4. **Observation of Flash and Thunder**:
- When lightning occurs, the light travels to our eyes almost instantaneously due to its high speed.
- The sound of thunder, however, travels much slower and takes more time to reach us.

5. **Conclusion**:
- As a result, we see the flash of lightning first and then hear the thunder a few seconds later. This delay is due to the vast difference in the speeds of light and sound.

### Final Answer:
The reason we see the flash and hear the thunder at different times is that the speed of light is much greater than the speed of sound.