Question:
Speed of light in vacuum is:
Speed of light in vacuum is:
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The speed of light in a vacuum is a fundamental constant in physics, denoted by $ c $, and its value is approximately $ 3 \times 10^8 \, \text{m/s} $. This value is crucial in many areas of physics, including optics, relativity, and electromagnetism.
Updated On: Jun 5, 2025
- $ 8 \times 10^3 \, \text{m/s} $
- $ 8 \times 10^6 \, \text{m/s} $
- $ 3 \times 10^6 \, \text{m/s} $
- $ 3 \times 10^8 \, \text{m/s} $
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The Correct Option is D
Solution and Explanation
Step 1: Understand the Speed of Light in Vacuum.
The speed of light in vacuum is denoted by \( c \) and is approximately: \[ c = 3 \times 10^8 \, \text{m/s}. \] Step 2: Analyze Each Option.
Option 1: \( 8 \times 10^3 \, \text{m/s} \) — Incorrect, much smaller than \( c \).
Option 2: \( 8 \times 10^6 \, \text{m/s} \) — Incorrect, still smaller than \( c \).
Option 3: \( 3 \times 10^6 \, \text{m/s} \) — Incorrect, too small by two orders of magnitude.
Option 4: \( 3 \times 10^8 \, \text{m/s} \) — Correct, matches the speed of light. Step 3: Final Answer.
\[ \boxed{3 \times 10^8 \, \text{m/s}} \]
The speed of light in vacuum is denoted by \( c \) and is approximately: \[ c = 3 \times 10^8 \, \text{m/s}. \] Step 2: Analyze Each Option.
Option 1: \( 8 \times 10^3 \, \text{m/s} \) — Incorrect, much smaller than \( c \).
Option 2: \( 8 \times 10^6 \, \text{m/s} \) — Incorrect, still smaller than \( c \).
Option 3: \( 3 \times 10^6 \, \text{m/s} \) — Incorrect, too small by two orders of magnitude.
Option 4: \( 3 \times 10^8 \, \text{m/s} \) — Correct, matches the speed of light. Step 3: Final Answer.
\[ \boxed{3 \times 10^8 \, \text{m/s}} \]
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