题目内容
一雷达向一方向发射不连续的无线电波,每次发射的时间为百万分之一秒,两次发射的时间间隔是万分之一秒.图是雷达指示器的显示屏上显示的情景,P为发射出去的无线电波的某一尖形波,Q为其遇到障碍物反射回来被雷达接收到的尖形波.由图中所给信息计算障碍物离雷达站的距离.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036346092278.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036346092278.png)
12 km
由图知从发射无线电波到接收到此信号经历的时间为:Δt=
×
s=
s
障碍物到雷达站的距离为l,则有2l=cΔt,
得l=
=
×
m=12 000 m=12 km.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003634641381.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003634656426.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003634672473.png)
障碍物到雷达站的距离为l,则有2l=cΔt,
得l=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003634703530.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003634719642.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003634672473.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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