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    emilyfaragher14's Avatar
    emilyfaragher14 Posts: 1, Reputation: 1
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    #1

    Sep 23, 2013, 07:00 PM
    Light travels at a constant speed of 3.00 x 10 to the 8th power m/s, whereas sound tr
    Light travels at a constant speed of 3.00 x 10 to the 8th power m/s, whereas sound travels through the air at a constant speed of 340 m/s.
    a) How long does it take for light to travel from a lightning strike to an observer 1.00 km away?
    b) How long after the flash is seen is the thunder produced by the lightning heard?
    engr76vpi's Avatar
    engr76vpi Posts: 9, Reputation: 1
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    Sep 23, 2013, 09:30 PM
    Time for light to travel 1 km = 1000/3 x 10(8th) = 3.33 x 10(-6th) = 0.0000033 secs
    Time for thunder to travel 1km = 1000/340 = 2.94 sec
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