everyday science MCQ #49985

The speed of light in a vacuum is:

everyday science MCQ #49985

  1. Question 1

    Q1. The speed of light in a vacuum is:

    • A) 3 × 10⁸ m/s
    • B) 3 × 10⁶ m/s
    • C) 3 × 10¹⁰ m/s
    • D) 3 × 10⁴ m/s

    Answer: 3 × 10⁸ m/s

    Explanation: The speed of light in a vacuum is approximately 3 × 10⁸ m/s (more precisely 2.998 × 10⁸ m/s), a fundamental physical constant denoted by c. This value is the universal speed limit and is central to Einstein's theory of special relativity.