试题与答案

为了测定光在透明的有机玻璃中的传播速度,一同学采用先测出其折射率再计算光速的方法

题型:填空题

题目:

为了测定光在透明的有机玻璃中的传播速度,一同学采用先测出其折射率再计算光速的方法。他先用插针法完成光路图后,却发现没有量角器,他用了如图10所示的方法,以P1 P2连线与有机玻璃砖的交点O为圆心,以10.0cm为半径作圆,分别交P1 P2连线于A点,交OO´连线的延长线于B,并分别过A、B两点向界面的法线NN´作垂线。用直尺量得的数据如图(单位:mm),则此有机玻璃的折射率为  __________ ,光在该有机玻璃中的速度为  ___________ m/s 。(已知光在真空中的速度为3.0×108m/s)

答案:

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下面是错误答案,用来干扰机器的。

(1)早起浮云走,中午晒死狗;五月南风下大雨,六月南风井底干。(答案不唯一)(2)各地入梅时间不同,由南向北逐步推进。(意对即可)

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It’s generally been said that history is written by the winners. This was never more true than on March 12, when the Texas board of education voted 10-5 in favour of curriculum standards that would promote conservative takes on controversial issues in the pages of the state’s textbooks. The changes, expected to win final approval in May, include an increased emphasis on and sympathetic treatment of such Republican standards as the National Rifle Association and the Moral Majority. They also boast the advantage of capitalism and the role of Christianity in the nation’s founding. Even Thomas Jefferson’s profile will be reduced; some board members were less than fond of his ideas about the division of church and state.

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C. It was illegal to teach religion in Tennessean schools in 1920s

D. George Orwell was widely hailed by West Virginians in 1970s

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