题目内容
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[单选题]
声速测量采用位相比较法测波长时，可通过示波器观察李萨如图形来判断相位差。李萨如图形一般是稳定的椭圆，当椭圆变为倾斜的直线时，输入示波器相互垂直两信号的相位差为（）
A.0
B.π
C.π/2
D.3π/2
答案
半波长的整数倍，半个波长
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A.λ
B.λ/2
C.λ/4
D.λ/7
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第8题
某同学测出的声速值比正常高了一倍，原因可能是 The sound velocity measured by a student is twice as high as the normal value. The reason may be that
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