The difference between the sight of ligtening and the sound of thunder is measured to be 2 seconds. The SPL at the same location where 2 seconds was measured is 85dB re 20uPa.  What is the distance to the ligtening?

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The difference between the sight of ligtening and the sound of thunder is measured to be 2 seconds. The SPL at the same location where 2 seconds was measured is 85dB re 20uPa. 

What is the distance to the ligtening?

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