What is the speed of light in a vacuum?

A) 3 × 10⁶ m/s

B) 3 × 10⁸ m/s

C) 3 × 10¹⁰ m/s

D) 3 × 10⁴ m/s

Explanation

The speed of light in a vacuum is approximately 3 × 10⁸ m/s (299,792,458 m/s exactly). It's a fundamental constant.