➡Lightning can be seen before thunder is heard as light travels faster than sound. The speed of sound in air is just over 300m/s. ... The noise of thunder is caused by the rapid expansion of heating the air. You can normally hear thunder up to 6 miles (10km) away from the lightning flash....
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➡Lightning can be seen before thunder is heard as light travels faster than sound. The speed of sound in air is just over 300m/s. ... The noise of thunder is caused by the rapid expansion of heating the air. You can normally hear thunder up to 6 miles (10km) away from the lightning flash....
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