问题
选择题
2002年诺贝尔物理学奖中的一项,是奖励美国科学家贾科尼和日本科学家小柴晶俊发现了宇宙X射线源.X射线是一种高频电磁波,若X射线在真空中的波长为λ,以h表示普朗克常量,c表示真空的光速,以E和m分别表示X射线每个光子的能量和质量,则( ) A.E= B.E= C.E= D.E= |
答案
答案:D
2002年诺贝尔物理学奖中的一项,是奖励美国科学家贾科尼和日本科学家小柴晶俊发现了宇宙X射线源.X射线是一种高频电磁波,若X射线在真空中的波长为λ,以h表示普朗克常量,c表示真空的光速,以E和m分别表示X射线每个光子的能量和质量,则( ) A.E= B.E= C.E= D.E= |
答案:D
阅读下面的短文,判断文后的句子是否与短文内容相符,符合的选T 不符合的选F(共4小题,每小题2分) Life in 2050 What will life be like in the year 2050? No one knows, but of course it will be very different from it today Here are some predictions: Firstly, people will work fewer hours, and robots will do hard and dangerous work instead.So they will have more free time for sports and travelling. Secondly, cars, will run faster, and computers will control(控制) the speed instead of people. So there won't be any accidents. Thirdly, people will be able lo live in the sea. away from the crowded and noisy cities on land. Lastly, water will have become one of our most serious problems because there could be serious shortage(短缺). Some scientists open predict that water could be the cause of war if we don'i act now.
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