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# Rumus gelombang bunyi

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### Rumus gelombang bunyi

1. 1. GELOMBANG BUNYI GETARAN w k = konstanta pegas 1. k = W = berat xhttp://www.banksoal.sebarin.com x = perubahan panjang pegas F = gaya pegas y = simpangan 2. F=-k.y Ep = energi potensial Emek = energi mekanik Ek = energi kinetik 3. Ep = ½ ky2 A = amplitudo t = waktu ω = kecepatan sudut 4. E mek = ½ kA2 m = massa T = periode k = konstanta 5. Ek = ½ k (A2-y2) l = panjang f = frekuensi λ = panjang gelombang k ( A2  y 2 ) Lo = panjang mula-mula 6. v= ∆L = perubahan panjang m n = nada dasar ke Vp = kecepatan pendengar Vs = kecepatan sumber bunyi 7. k  m 2 P = daya R1= jarak 1 R2 = jarak 2 8. y  A sin t 9. v  A cos t 10. a   2 A sin t 11. Ek  1 2 m 2 A 2 cos 2 t 12. Ep  1 2 m 2 A 2 sin 2 t 13. E mek  1 2 m 2 A 2
2. 2. m 14. T  2 k l 15. T  2 ghttp://www.banksoal.sebarin.com GELOMBANG mekanik refleksi gel. gel. refraksi longitudinal transversal interferensi 1 Gelombang defraksi polarisasi 1 gel. elektromagnetik 1. v  f     vt  t x 2. y gel. berjalan = A sin 2    T   y diam ujung bebas   0 3. x  t L y  2 A cos 2 sin 2     T   1 y diam ujung terikat   2 4. x  t L y  2 A sin 2 cos 2     T  
3. 3. 5. F m v    E E = modulus young 6. v stress P F F  Lo  E   A http://www.banksoal.sebarin.com strain  L Lo A  L P v gas =   7. RT Cp =    M Cv BUNYI Gelombang Longitudinal nada > 20.000 Hz (Ultrasonic) keras / lemah tergantung Amplitudo Bunyi 20 Hz – 20.000 Hz desah < 20 Hz (Infrasonic) tinggi/rendah tergantung Frekuensi Nada Sumber 1. Dawai n  1P fn  n 1 v n  2s 2L ND 2 Pipa Organa Terbuka n  2P fn  n 1 v n  1s 2L 3. Pipa Organa Tertutup n  1P fn  2n  1 v n  1s 4L
4. 4. Sifat :  Refleksi (Pemantulan) v.tpp d 2  Resonansihttp://www.banksoal.sebarin.com ln = 2n  1  1 4  Interferensi (Percobaan Quinke)  memperkuat n  memperlemah n  1 1  2  Pelayangan (beat) Beat f layangan = f A  f B  Efek Doppler v  vP fP   fs v  vs  Intensitas P P I  A 4R 2 1 1 I1 : I 2  2 : 2 R1 R2  Taraf Intensitas (TI) I TI  10 log I0 I 0  10 12 Watt m 2 dB