December 2018 1 23 Report
Gema bunyi kentongan yg dipantulkan oleh sbuah tebing yg jaraknya 54m dri tmpt kentongan dipukul, terdengar 0,6s ssdh dipukul. gema dri sebuah tebiny yg lain terdengar 0,8s ssdh bunyi asli. jarak tebing dri sumber bunyi adalah????

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