Description : Why the statement The speed of light is 300 million ms is not always correct.?
Last Answer : When you have an interest in more signficant figures:299,792,456 m/s. It was measured in 1983 using wavelengths of acertain light from an atom, and that is what we got stuck with. ... if itis through a vacuum. (Shapiro time delay.)Light travels through different types of matter at differentspeeds