Among the substances listed, in which one does a beam of light travel at the highest speed?

(1 point)
Responses

Air
Air

Water
Water

Plastic
Plastic

Glass

1 answer

A beam of light travels fastest in air compared to water, plastic, and glass. Although light travels slower in air than in a vacuum, air is still the medium among the options listed where light travels at the highest speed. So, the answer is Air.