问题 选择题

关于电磁波的下列说法,正确的是(  )

A.电磁波可以在真空中传播

B.电磁波不能在空气中传播

C.麦克斯韦第一次通过实验验证了电磁波的存在

D.赫兹第一次通过实验验证了电磁波的存在

答案

AD

考点:

分析:真空不能传声,但可以传播电磁波;1864年,英国青年物理学家麦克斯韦在研究了当时所发现的电磁现象的基础上,建立了麦克斯韦电磁理论,并预言了电磁波的存在;1888年,德国青年物理学家赫兹第一次用实验证实了电磁波的存在

解答:解:电磁波可以在真空中传播,也可以在空气中传播,故A对B错

麦克斯韦预言了电磁波的存在,赫兹第一次通过实验验证了电磁波的存在,故C错D对

故选AD.

点评:此题考查:电磁波的传播、电磁波的预言,是一道基础题.

填空题
改错题

短文改错:(共10小题,每小题1分,满分10分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个(√);如有错误(每行只有一个错误),则按下列情况改正:

此行多一词:把多余的词用斜线(/)划掉,在该行右边横线上写上该词,并也用斜线划掉。

此行缺一词:在缺词处加一个漏字符(^),在该行右边横线上写上该加的词。

此行错一词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的请不要改。

Mrs Hunt’s sister said she is coming to see her              小题1:           

with his daughter. Mrs Hunt was happy                     小题2:           

because she has not seen her sisiter for months,. She knew      小题3:           

the girl liked bananas, and she was busy in the kitchen       小题4:           

and couldn’t go out. She gave any money                  小题5:            

to her son Bruce and said, “Go and buy two kilos bananas.”    小题6:            

Bruce liked bananas, either. Thirty minutes                 小题7:           

late he came back with the bananas. Mrs Hunt weighed       小题8:           

the bananas. And found they were half a kilo short. She took   小题9:           

out the bag to the shopkeeper and said, “I sent my little son   小题10:           

for two kilos of bananas, but you give him only one and a half kilos!”

“Have you weighed your little son, Madam?” asked the shopkeeper.”