Question

multiple - choice question
all electromagnetic waves move through the atmosphere at a rate of ____________. this is called the speed of light. (its the c in the ( e = mc^{2} ) formula you may have seen).
300,000 kilometers per second
300,000 meters per second
300,000 kilometers per hour

Explanation:

The speed of light in a vacuum (and approximately in the atmosphere) is \(3\times10^{8}\) meters per second. Since \(1\) kilometer \( = 1000\) meters, \(3\times10^{8}\) meters per second \(=300000\) kilometers per second.

Answer:

300,000 kilometers per second