The speed of sound in air at sea-level is 340ms-1, while that of light is 300 000kms-1. How far (to the nearest metre) from the centre of the thunderstorm is an observer who hears a thunder 2s after a lightening flash? a)170m b)340m c)600m d)680m?
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Asked by cooncudee on 9th May, 2014
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