Acoustical effects

	Acoustical effects
thunder research through history effects of thunder origin of thunder spreading of thunder lightning protection thunder research through history effects of thunder optical effects acoustical effects mechanical effects termical effects origin of thunder spreading of thunder lightning protection thunder research through history effects of thunder origin of thunder spreading of thunder facts about spreading of thunder classical models Erikssons model other models dimensioning of lightning rod lightning protection thunder research through history ancient explorations Benjamin Franklin recent researches effects of thunder origin of thunder spreading of thunder lightning protection thunder research through history effects of thunder origin of thunder spreading of thunder lightning protection for human for energetic facilities for overground lines for other objects thunder research through history effects of thunder origin of thunder lightning development kinds of lightning strike main features of lightning spreading of thunder lightning protection	DISTANCE FROM LIGHTNING STRIKE We believe that many people at least once in their life asked themselves a question "How close to me lightning stroked?". We can simply calculate that. When we see lightning we start to count seconds until we hear thunder. We multiply number of seconds with speed of sound in air, which is about 340 meters in second. Result is exactly what we are looking for, distance from the lightning strike (in meters). Speed of light, which is about 300 000 kilometres in second, is ignored because it has a lot bigger value than speed of sound. Example: We see lightning. Counting 1, 2, 3, and 4. We hear thunder and multiply 340 with 4 what is equal 1360 and matches what we are looking for (distance in meters).