October 2018 2 39 Report
Manfaat bunyi pantul
1. Mengetahui cepat rambat bunyi di udara 2. Mengukur jarak antara lembah dan puncak bukit
3. Mengetahui jenis suara
4. Mengetahui jarak tebing

menurut kalian 1 & 4 atau 2 & 4?

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