0  356285  356293  356299  356303  356309  356311  356315  356321  356323  356329  356335  356339  356341  356345  356351  356353  356359  356363  356365  356369  356371  356375  356377  356379  356380  356381  356383  356384  356385  356387  356389  356393  356395  356399  356401  356405  356411  356413  356419  356423  356425  356429  356435  356441  356443  356449  356453  356455  356461  356465  356471  356479  447090 

1、 实验

   1801年,(英)托马斯·杨

    单色光   单孔屏    双孔屏    接收屏

 

试题详情

4、光电效应--证明光具有粒子性

 

试题详情

3、光的电磁说--(英)麦克斯韦,光是一种电磁波

试题详情

2、波动说--(荷兰)惠更斯、(法)菲涅尔,光在“以太”中以某种振动向外传播

成功--反射、折射、 干涉、衍射

困难--光电效应、康普顿效应、偏振

19世纪以前,微粒说一直占上风

(1)    人们习惯用经典的机械波的理论去理解光的本性。

(2)    牛顿的威望

(3)    波动理论本身不够完善 (以太、惠更斯无法科学的给出周期和波长的概念)

试题详情

1、  微粒说--(牛顿)认为个光是粒子流,从光源出发,在均匀介质中遵循力学规律做匀速直线运动。

    成功--直线传播(匀速直线运动)、反射(经典粒子打在界面上)

    困难--干涉,衍射(波的特性),折射(粒子受到界面的吸引和排斥:折射角、不能一视同仁),光线交叉

试题详情

70. John caught a cold on Saturday and ______ in bed ever since.

  A. was        B. has been  C. is          D. have been

时态和语态专练答案

  1-5 BBBCC  6-10 BABAB   11-15 DDABD  16-20 CCABD

21-25 CDAAB  26-30 CBDAD  31-35 CDACA  36-40ABADC

41-45 DDCCD  46-50 BBDCB  51-55 CADCB  56-60 ADDAA 

61-65 ABACB  66-69 CDADB

试题详情

69. --- How does your second-hand car run?

 --- It ___ run all right, but it is being repaired.

A. has     B. had     C. doesn’t    D. used to

试题详情

68. ----I thought you were proud of the work I _____.

 ----I’m afraid not . You’d better change it for another.

A. do     B. had done   C. did   D .would do

试题详情

67. In 1960, this was the longest bridge that ___.

A. was ever built   B. had ever built  C. has ever been built   D. had ever been built

试题详情

66. He ____ a model plane the whole morning. I supposed he would also do some washing.

A. made     B. has made    C. was making   D. has made

试题详情


同步练习册答案