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冯雁得意洋洋的看了看台下学子,满脑子冒坏水,再次说道:

“当一个人蒙住眼睛肯定走不了直线。”

“不可能吧。”

“就是,只要记住眼前的方向定能直向行走。”

“既然大家不相信,咱们就做个实验,来,刚才说话的二位学子请到台前来。”冯雁说着,找出一块黑布。

冯雁指着前方,对上来的两人说道:

“你们先记住眼前的方向,待我画条直线。”

明德堂呈长方形,南北二十余丈,东西约十八丈。

冯雁取来笔墨,打量了一番,遂沿着讲台侧边处至最后方木墙处画了一条直线,这条直线的距离大约有二十丈。

冯雁将那名瘦小的书生叫来蒙上眼睛,然后让其往木墙处走去。只走了丈许,路线已经歪了,众书生不断好笑出声。待这名书生停下脚步后,摘下黑布看向后方,才知自己竟然偏差了很多。脸色一红,这名书生赶紧溜回到自己的座位处。

又将那名胖胖的书生叫来,同样走去,走了数丈,只听一声尖叫传出:“哎呀,我的笔墨!”

胖书生摘下黑布看去,自己竟然斜着走到众书生的座位中间了,还碰翻了一名书生置于书案上的笔墨。

“哈哈……”

谢安、许询、王蕴等人从没见过这么有趣的实验,皆大乐不已。

冯雁收住笑容,很严肃的问道:

“谁能解释一下,为何蒙住眼无法走直线?”

还在欢笑的众人听到疑问,均面现难色。

冯雁接着又问了几个问题,众人脸色更加难看了。

“苹果为何只会落于地面而不会掉入天空?方兄,你知道吗?”一名书生问向自己的同桌。

“我知道吗?我父亲也不知,遑论是我!”被问到的书生一脸气急败坏。

“为何先看到闪电才听到雷声?不是同时出现吗?”又一名书生对着房顶喃喃自语。

“叔父,这个问题如何回答?”谢道韫悄悄问向自己的叔父谢安。而谢安则尴尬地笑了笑辩解道:

“天为什么是蓝的?此子的问题有失偏驳,天空有时也会呈现红色,对了,下雨时是灰色。”

“冯郎君问得的是现在!现在天空为何为蓝色?”谢道韫暗自白了一眼一向崇敬的叔父,心中腹诽:“叔父乃是顾左右而言他!”

谢道韫又悄声问向王蕴。

王蕴老脸一红,从怀中掏出酒囊喝了一大口,含糊其辞道:

“刚才冯小兄所问为甚?”

谢道韫无奈地摇了摇头又看向车胤与许询,二人同样老脸微红,皆避开谢道韫的眼光看向别处。

冯雁暗自一笑开口道:

“既然众位不愿赐教,那冯某就献丑了。”

“马兄,我想吐血。”

“哼!欺人太甚,我倒要看看如何作答?”刚才那位胖胖的马姓书生有些怄气。

“先看到闪电,乃是因为光的速度大于声音的速度。苹果掉地下那是地球之引力作用……”

众人听了冯雁的解答也不知是否正确,皆是茫然加狐疑之色。

冯雁见此,突发奇想道:

“诸位如果不信,咱们晚上做个实验就知道了。”

“如何做?”

“简单!选择远处山头站与其上,同时点火、敲锣。如此,便可知光与声音的速度有快慢之分。”

声音的速度对现代人来说基本上妇孺皆知,三百四十米每秒。只要选在千米之外做实验,便会有三秒的时差。

谢安等人本来打算讲完课便出发返京,但听了冯雁这么多的问题又要做实验,也激起了好奇心想一睹为快。于是便安排在次日出发。

到了晚间,一切准备就绪,冯雁便开始动手做实验。

喜欢大晋狂人请大家收藏:大晋狂人本站更新速度全网最快。

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