Multiple choice general knowledge science & technology "C" is the symbol for: carbon compounds velocity of light california Reveal answer Fill a bubble to check yourself C Correct answer Explanation In physics, lowercase 'c' is the standard symbol for the speed of light in vacuum (approximately 3×10^8 m/s). This is a fundamental constant in physics, used in equations like E=mc². Carbon's symbol is 'C' (uppercase), not 'c'.