Question

PLZ HELP!!!! IF YOU GET ME WRONG ILL REPORT U!
In which of the following substances does a beam of light travel the fastest?
Group of answer choices

air

water

plastic

glass

Answer 1

$\huge{\underline{\underline{\green{\mathfrak{Answer:}}}}}$

Air is the correct answer

$\mathbf{\fbox{speed \:of\: the\: light = 3 × 10^8 m/s}}$