What is the speed of light in a vacuum?

The speed of light in a vacuum is widely accepted as approximately 299,792,458 meters per second. For practical purposes and in scientific notation, this is often rounded to 3e8 m/s. This figure is fundamental in physics and is a critical constant in various equations, such as those in electromagnetic theory and relativity.

Given that the options provided include several magnitudes in the speed of light, the choice of 3e8 m/s accurately reflects the scientific understanding of this physical constant. It's important for students in meteorology and related fields to grasp this value, as it underpins many concepts in wave propagation, including radar technologies, where the speed of electromagnetic waves is crucial for interpreting radar signals and understanding atmospheric phenomena.

Understanding the speed of light also aids in comprehending how radar systems operate, as they transmit electromagnetic waves and measure the time it takes for those waves to reflect back from targets. This time measurement is then used to calculate distance, which inherently relies on the established speed of light. Thus, the choice of 3e8 m/s is not only correct but also vital for broader applications in meteorology and physics.