What is the speed of light in a vacuum?
✓ Correct Answer: Option B
The speed of light in a vacuum is approximately 3 × 10⁸ m/s (299,792,458 m/s exactly). It's a fundamental constant.
The speed of light in a vacuum is approximately 3 × 10⁸ m/s (299,792,458 m/s exactly). It's a fundamental constant.