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千千万万遍
共计3小时考试时间
此套试卷由两部分组成
20道选择题
以及3道简答题组成
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Part A选择题部分:
Part B简答题部分
Solution to Problem 1:
The wavelength of the radio signals is λ=c/ƒo=25m.Clearly for Θ=0 and Θ=π/2 the interference is constrcutive .The amplitude of the signal picked up by the plane is twice the amplitude of the signal to the tower alone .Since intensity is proportional to the square of the amplitude,the intensity recevied is I=4I
For destrcutive interfernce we sovie
l sin(θ)=(2n+1)λ/2
where l = 100 m is the tower separation and n is aninteger . This is standard two source interfernce with the receiwer much farther way than the spacing the sources .The angular heading that result from
this are θ=7.2,22.0,38.7,and61.0. A heading of 30 corresponds to constructive interference and the signal strength from the towers would be a maximum.
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