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OpenStudy (anonymous):
to find how far away a lightning flash is, a rough rule is the following: "Divide the time in seconds between the flash and the sound by three. The result equals the distance in km to the flash". Justify this.
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OpenStudy (irishboy123):
compare the speeds of lightening and sound as they travel toward you. light is pretty instantaneous, sound travels at c 330 m/s.
OpenStudy (anonymous):
Thanks! :)
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