Travel time around the Earth. Calculate the approximate time it takes for an electromagnetic signal to travel around the circumference of the Earth. Assume the Earth to be a perfect sphere with an average diameter of 1.274 × 104 km.
Write the formula to find the travel time .
The Earth’s circumference is .
Air velocity v is known as c.
Substitute for l and v for c.
D is the diameter,
c is speed of travel in free space.
Consider the speed of travel in free space as .
Substitute for c and for D in equation (1).
Thus, the travel time is .
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