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OpenStudy (anonymous):

A person observes a fireworks display from a safe distance of .75 km. Assuming that sound travels at 340 m/s in air, what is the time between the person seeing and hearing a fireworks explosion?

OpenStudy (anonymous):

light travels at roughly 300,000,km/s so time for the image to get to u ~ .75/300,000 .75km =750m so time for sound to get to u ~750/340

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