本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理
[问答题]
A highway overpass was 8n2ej; 9(0eqidvctsv observed tbm :m0x 7zh,lyo resonate as one full loop ($\frac{1}{2}\lambda$) when a small earthquake shook the ground vertically at 4.0 Hz. The highway department put a support at the center of the overpass, anchoring it to the ground as shown in Fig. 12–36. What resonant frequency would you now expect for the overpass? Earthquakes rarely do significant shaking above 5 or 6 Hz. Did the modifications do any good?
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