![]() Early scientists had noticed this same phenomenon. As we already mentioned, the flick of a light switch instantaneously fills a room with light. It's super fast!īut exactly how fast is light? You certainly can't measure it with your eyes. What are we talking about? Light, of course! When you flip the light switch, does light act like water? Do you see it shoot out of the light bulb and splash over the walls like a wave? No! Light fills the room everywhere instantaneously. ![]() It's fun to watch the first waves of water reach the end of the bathtub and splash up along the sides. If you take baths, you may have noticed how water rushes out of the nozzle and begins to fill the tub. When you turn the handle, water shoots out really fast. Do you know what's really fast? Water! Watch the shower head the next time you get ready to clean up in the morning.
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