4岁女童被雷震死 专家:雷击次声波引身体共振
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6月20日,余杭一个4岁女童坐在其奶奶腿上吃饭时被雷震死。
当天下午1时多,女童因感冒躺在床上,其奶奶给她喂米粥。这时外面开始下雨,雨不大,但雷打得很多。女童说害怕,奶奶便把她抱起放在腿上喂。这时一个大雷把她家房门劈了。女童吓得把头埋在奶奶怀里,后来抬头看了奶奶一眼,便昏了过去。
下午2时多,女童被送到余杭第一人民医院,此时女童心跳呼吸已停止。医生仔细检查,并没有发现女童有被雷电直接击中的痕迹。经抢救,女童虽有了心跳,但呼吸仍靠呼吸机。晚上8时半,医生宣布抢救无效死亡。
次日,浙江省防雷中心的雷电专家赶到医院调查,专家初步认定为是雷击时造成的次声波引起人体共振,导致了女童的不幸。(朱丹阳
夏阳)
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自然界里,声波的频率范围十分宽广,人的耳朵只能听到频率在20-20000Hz(赫兹)之间的声波,低于20Hz的声波称为次声波。
次声波是一种每秒钟振动数很少,人耳听不到的声波。但这样的振动频率,刚好和人体器官的固有频率相近,其作用于人体时,会引起人体内脏的“共振”,当人的腹腔、胸腔等固有的振动频率与外来次声频率一致时,会使内脏受损甚至丧命。
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