Who measured the speed of light first

Options

A. Galileo
B. Newton
C. Romer
D. Einstein

Answer

To answer the question "Who measured the speed of light first?", we can follow these steps:

### Step 1: Identify the person who first measured the speed of light.
- The first person to measure the speed of light was Ole Rømer.

### Step 2: Note the year when this measurement was made.
- Ole Rømer made his calculations in the year 1676.

### Step 3: Understand the significance of Rømer's work.
- Rømer was a Danish astronomer, and his work was significant in the field of astronomy and physics.

### Step 4: Recall the value of the speed of light.
- The speed of light is represented by the symbol "C" and is approximately 3 x 10^8 meters per second or 3 x 10^5 kilometers per second.

### Step 5: Conclude the answer.
- Therefore, the answer to the question is that Ole Rømer was the first to measure the speed of light in 1676.

### Final Answer:
- The first person to measure the speed of light was Ole Rømer in the year 1676.

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