试题与答案

(1)2011年3月,日本地震引发海啸,继而福岛核电站(世界最大的核电站)发生核

题型:问答题

题目:

(1)2011年3月,日本地震引发海啸,继而福岛核电站(世界最大的核电站)发生核泄漏。关于核电站和核辐射,下列说法中正确的是        

A.核反应堆发生的是轻核聚变反应

B.核反应堆发生的是重核裂变反应

C.放射性同位素的半衰期长短由核内部本身决定,与外部条件无关

D.放射性同位素的半衰期长短与地震、风力等外部环境有关

(2)如图所示,A、B两木块靠在一起放于光滑的水平面上,A、B的质量分别为mA=2.0kg和mB=1.5kg。一个质量为mC=0.5kg的小铁块C以v0=4m/s的速度滑到木块A上,离开木块A后最终与木块B一起匀速运动。木块A在铁块C滑离后的速度为vA=0.4/m/s。求:

①铁块C在滑离A时的速度;

②最终木块B的速度。

答案:

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