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Science – Distance to Lightning using Sound (Flash-Bang method)

Posted on: April 23, 2017

After watching the video, let’s try this question:

Sound travels at a speed of about 330 metres per second in air. Light travels at 300 000 kilometres per second in air.

You see the lightning (before / after) you hear the thunder during a thunderstorm, because light travels (slower / faster) than sound.

The time difference between seeing the lightning and hearing the thunder lets you calculate how far away you are from the storm.

During a thunderstorm, Jason saw lightning and nine seconds later heard thunder. Approximately how far away was the storm? ____________ km.

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