Traditional Culture Encyclopedia - Weather forecast - Weather and the speed of light
Weather and the speed of light
The propagation speed of light in the air is about 3× 10 8 m/s, while the propagation speed of sound in the air is about 340m/s. Because the propagation speed of light is greater than that of sound, we see lightning first, and then hear thunder.
∫v = s t，
∴ distance traveled by light in 1 sec: s = vt = 3×108m/s×1s = 3×108m.
Then the length of the equator of the earth is 3×1.08m7.5 = 4,000,000m = 4×1.04km. 。
So the answer is: the speed of light in air is much faster than the speed of sound; 4× 10 4 .
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