September 2018 2 102 Report
Seseorang naik sepeda dgn kecepatan 36 km/jam bergerak berlawanan dgn mobil polisi melaju 72 km/jam. Jika frekuensi sirine mobil polisi 1280 Hz, maka pengendara sepeda akan mendengar sirene dgn frekuensi...... (Vo 340 Hz) mohon bantuannya :)
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