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I can't tell what exactly you may have heard, but sounds reflect off of all kinds of things, particularly flat walls, so echos from a loud sound like thunder is quite plausible. 5 seconds is about 1 mile of total propagation, so that again is plausible. Lightning is a large current that ionizes the air in its immediate vicinity. Such ionized air is ...

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Of course lightning "has a frequency component". If it didn't have non-zero frequencies, it could never start or would last indefinitely. Lightning is a huge current pulse over a short time, usually several pulses over a few milliseconds. But more importantly, the current is started and stopped very abruptly, which by necessity means it has a broad ...

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According to wikipedia, average duration of a lightning is $30\,\mu s$. If we take a gaussian current splash with $\sigma=30\,\mu s$, its spectrum will be a gaussian with $\sigma_k\approx33\,\text{kHz}$. This doesn't look like DC.

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