To determine the size of the planet based on the time it takes for light to travel around it, we can use the speed of light, which is approximately \(299,792,458\) meters per second.
Question 1: Light taking 1 second to travel across the planet
In this case, if light takes 1 second to travel across the planet, it means it covers a distance equal to the diameter of the planet in that time:
\[ \text{Distance} = \text{Speed of Light} \times \text{Time} \]
Substituting in the values we have:
\[ \text{Distance} = 299,792,458 , \text{m/s} \times 1 , \text{s} = 299,792,458 , \text{meters} \]
So, the diameter of the planet is \(299,792,458\) meters.
Question 2: Light taking 52 seconds to travel around the entire planet
If light takes 52 seconds to travel around the planet, then it covers the circumference of the planet in that time:
\[ \text{Circumference} = \text{Speed of Light} \times \text{Time} \]
Substituting in the values:
\[ \text{Circumference} = 299,792,458 , \text{m/s} \times 52 , \text{s} = 15,592,789,816 , \text{meters} \]
To find the diameter from the circumference, we can use the formula:
\[ \text{Circumference} = \pi \times \text{Diameter} \]
Rearranging gives us:
\[ \text{Diameter} = \frac{\text{Circumference}}{\pi} \]
Now substituting the circumference we calculated:
\[ \text{Diameter} = \frac{15,592,789,816}{\pi} \approx \frac{15,592,789,816}{3.14159} \approx 4,973,097,785 , \text{meters} \]
Summary
- If light takes 1 second to travel across the planet, the diameter is approximately \(299,792,458\) meters.
- If light takes 52 seconds to travel around the planet, the diameter is approximately \(4,973,097,785\) meters.