gc textbook chapter 12 Sound (id: 04e4a30a0)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理

[填空题]
A hiker determines the +b. rvaii2(*jq 4wflybfnl gl./2z.flength of a lake by listenix dx90c0a7d t(3n yoymng for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.0 s after shouting. Estimatean 0xc0m o9( dtdxy37y the length of the lake. $\approx$    $ \times10^{ 2}$m

参考答案: 3.4±2%


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