Nikolaus N

10 Mei 2024 17:37

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Nikolaus N

10 Mei 2024 17:37

Pertanyaan

A car moving at a speed of 20 m/s approaches a moving observer. If the frequency of the sound heard by the observer is 400 Hz, while the original frequency of the sound produced by the car is 500 Hz, determine the speed of the observer.

A car moving at a speed of 20 m/s approaches a moving observer. If the frequency of the sound heard by the observer is 400 Hz, while the original frequency of the sound produced by the car is 500 Hz, determine the speed of the observer.

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Nicky N

11 Mei 2024 15:39

Sebuah mobil yang bergerak dengan kecepatan 20 m/s mendekati seorang pengamat yang juga sedang bergerak. Jika frekuensi suara yang didengar oleh pengamat adalah 400 Hz, sedangkan frekuensi asli suara yang dihasilkan oleh mobil adalah 500 Hz, tentukan kecepatan pengamat. Penyelesaian: Untuk menyelesaikan masalah ini, kita dapat menggunakan rumus untuk efek Doppler: f' = f.(v.vo)/v+vs Dimana: f' adalah frekuensi yang diamati, f adalah frekuensi asli, v adalah kecepatan suara dalam udara vo adalah kecepatan pengamat relatif medium vs adalah kecepatan sumber relatif terhadap medium. Maka diketahui f= 500Hz, f'= 400Hz, kecepatan suara v = 343 m/s, kecepatan mobil vs = 20m/s Maka kecepatan pengamat (vo): 400= 500.(343+vo) / 343+20 400.(343+20) = 500.(343+vo) 400.363 = 500.363+500.vo 500.vo = 400.363-500.363 500.vo = -100 x 363 Vo = -100. 363/500 Vo = -36300/500 = -72.6m/s Tanda negatif menunjukkan bahwa pengamat menjauh dari sumber. Jadi, kecepatan pengamat relatif terhadap medium adalah 72.6m/s. Semoga membantu^^


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