February 2019 1 52 Report
Gelombang ultrasonik dipancarkan ke dasar laut. Selang waktu 1,5 sekon sesudah gelombang dipancarkan pantulan ultrasonik dari dasar laut tertangkap kembali dipermukaan laut. Jika cepat rambat bunyi di laut 1500 m/s, kedalaman laut tersebut adalah
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