Assalammualaikum wr.wb. Halo teman-teman apa kabar? semoga dalam keadaan sehat wal afiat. amin ya rabbal alamin. Pada kesempatan kali ini masharist.com akan membagikan tentang Contoh Soal Fisika, yaitu Intensitas dan taraf intensitas bunyi serta Efek Doppler Materi ini merupakan materi untuk siswa kelas XI. Semoga bermanfaat ya. Kumpulan Contoh Soal dan Pembahasan Intensitas dan Taraf Intensitas Bunyi 1. Bunyi mempunyai intensitas 1 x 10⁻⁵ W/m². Berapa taraf intensitasnya dalam satuan desibel (dB) ?a)50b)60c)70d)80PembahasanDiketahui : I = 1 x 10⁻⁵ W/m2Io = 1 x 10^-12 W/m2Ditanya : Taraf Intensitas (dB) ?Jawaban :TI = 10 log (I / Io) TI = 10 log ( 10⁻⁵/ 10^-12)TI = 10 log (10⁷)TI = 10 (7)TI = 70 dB Taraf intensitasnya dalam satuan desibel (dB) adalah 70 dB 2. Diketahui terdapat bunyi yang mempunyai intensitas 10⁻⁴ W/m². Berapakah taraf intensitasnya dalam satuan desibel (dB) ?a)20b)30c)40d)50PembahasanDiketahui :I = 1 x 10⁻⁴ W/m²Io = 1 x 10⁻¹² W/m²Ditanya : Taraf Intensitas (dB) ?Jawaban :TI = 10 log (I / Io)TI = 10 log (10⁻⁴ / 10⁻¹²)TI = 10 log (10⁸)TI = 10 (8)TI = 80 dB Taraf intensitasnya dalam satuan desibel (dB) adalah 80 dB 3. Bunyi mempunyai intensitas 1 x 10^-9 W/m². Berapa taraf intensitasnya dalam satuan desibel (dB) ?a)20b)30c)40d)50PembahasanDiketahui :I = 1 x 10^-9 W/m2 Io = 10⁻¹² W/m²Ditanya : Taraf Intensitas (dB) ?Jawaban :TI = 10 log (I / Io)TI = 10 log (10^-9 / 10^-12)TI = 10 log (10³)TI = 10 (3)TI = 30 dB Taraf intensitasnya dalam satuan desibel (dB) adalah 30 dB 4. Taraf intensitas bunyi dalam suatu ruangan adalah 100 dB. Berapa intensitas bunyi dalam ruangan tersebut ? .......x 10⁻² W/m² a)1b)2c)3d)4PembahasanDiketahui :TI = 100 dB Io = 10⁻¹² W/m^2Ditanya : Intensitas bunyi (I) dalam ruangan ?Jawaban :Taraf intensitas (TI) = 10 log I/I₀㏒ (I / I₀) = TI / 10I / I₀ = 10^(TI / 10)I = I₀ [10^(TI / 10)] = 10⁻¹² [10^(100 / 10)] = 10⁻² W/m² Intensitas bunyi dalam ruangan tersebut adalah 1 x 10⁻² W/m² 5. Dua gelombang bunyi mempunyai intensitas 1 x 10⁻⁵ W/m2 dan1 x 10⁻⁴ W/m². Perbedaan taraf intensitasnya dalam dB adalah…a. 10 dBb. 20 dBc. 30 dBd. 40 dBe. 50 dBPembahasanDiketahui :intensitas 1 (I₁) = 1 x 10⁻⁵ W/m²intensitas 2 (I₂) = 1 x 10⁻⁴ W/m²taraf intensitas pendengaran (I₀) = 10⁻¹² W/m²Ditanya : Perbedaan taraf intensitas (TI) dalam dB ?Jawaban :Taraf intensitas (TI) = 10 log I/I₀TI₁ = 10 log (10⁻⁵/10⁻¹²)TI₁ = 10 log (10⁻⁵⁺¹²)TI₁ = 10 log (10⁷)TI₁ = 10 (7)TI₁ = 70 dBTI₂ = 10 log (10⁻⁴/10⁻¹²) = 10 log (10⁻⁴⁺¹²) = 10 log (10⁸) = 10 (8)TI₂ = 80 dB Perbedaan taraf intensitas = 80 dB - 70 dB = 10 dB6. Tentukan perbandingan intensitas dua bunyi yang taraf intensitas adalah 10 dB dan 40 dB.PembahasanDiketahui :TI1 = 10 dBTI2 = 40 dBIo = 10⁻¹² W/m²Ditanya : Perbandingan intensitas kedua bunyi (I1 : I2) ?Jawaban : Perbandingan intensitas kedua sumber bunyi : Perbedaan taraf intensitas = 80 dB - 50 dB = 20 dB 8. Daya yang dihasilkan dari bunyi mesin Diesel pada jarak R sebesar 10π watt dan taraf intensitas bunyi yang didengar sebesar 70 dB. Jika intensitas ambang bunyi Io = 10⁻¹² W/m² maka hitunglah jarak R.a.250 mb.500 mc.750 md.1000 mPembahasanDiketahui :P = 10π watt TI = 70 dBIo = 10⁻¹² W/m²Ditanya : jarak R ?Jawaban : Maka didapat jarak R adalah 500 meter.9. Sebuah sumber gelombang bunyi dengan daya 50 W memancarkan gelombang ke medium di sekelilingnya yang homogen. Tentukan intensitas radiasi gelombang tersebut pada jarak 10 meter dari sumber ...A.0,04 W/m²B.0,05 W/m²C.0,06 W/m²D.0,08 W/m²E.0,01 W/m²PembahasanDiketahui :P = 50 Wr = 10 meterIo = 10⁻¹² W/m²Ditanya : intensitas radiasi gelombang (I) ?Jawaban :Intensitas bunyi pada jarak rI = P / (4π r²)I = 50 / (4π • 10²)I = 1/(8π) ≈ 0,04 W/m²Maka didapat intensitas radiasi gelombang (I) adalah 0,04 W/m²10. Jarak A ke sumber bunyi adalah 3 kali jarak B ke sumber bunyi. Intensitas bunyi yang di terima A dibandingkan dengan intensitas bunyi yang diterima B adalahPembahasanDiketahui :Ra = 3 RbIo = 10⁻¹² W/m²Ditanya : perbandingan intensitas ?Jawaban :Ra = 3 RbIa/ Ib = Rb^2 / Ra^2Ia/Ib = Rb^2 / (3Rb)^2Ia/Ib = rb^2 / 9Rb^2Ia/Ib = 1/9 Jadi perbandingan intensitas yang diterima a dan b adalaha 1 : 911. Jika jarak 3 m dari sumber ledakan terdengar bunyi dengan taraf intensitas 50 db, maka pada jarak 30 m dari sumber ledakan itu akan terdengar bunyi dengan taraf intensitas. a.30 dB e.70 dBPembahasanDiketahui :R₁ = 3 mR₂ = 30 mTI₁ = 50 dBDitanyaTI₂ = ?Jawaban : 12. Taraf intensitas sebuah mesin rata-rata 50 dB. Apabila 100 mesin dihidupkan bersamaan, maka taraf intensitasnya adalah ...A. 20 dBB. 50 dBC. 70 dBD. 75 dBE. 150 dBPembahasanDiketahui :TI₁ = 50 dBn= 100Ditanya :TI₂ = ?Jawaban : Intensitas dan taraf intensitas bunyi serta Efek DopplerNAME :CLASS :DATE : 37.Taraf intensitas suatu mesin adalah 50 db dan taraf intensitas halilintar adalah 80 db, maka perbandingan intensitas bunyi halilintar dengan mesin adalah a)500 : 1b)200 : 1c)100 :1d)1000 : 1e)900 : 1
https://quizizz.com/admin/quiz/5e809ae5382421001dc0f5aa/efek-doppler-dan-taraf-intensitas-bunyi https://quizizz.com/admin/quiz/5e78325ccbef1e001bd820ee/intensitas-dan-taraf-intensitas-bunyi https://quizizz.com/admin/quiz/5c9eb7bd1c3dda001bcca014/intensitas-bunyi ENGLISH VERSION Hello friends how are you? hope you are in good health. amen ya rabbal alamin. On this occasion, masharist.com will share about Examples of Physics Problems, namely the intensity and level of sound intensity and the Doppler Effect This material is material for class XI students. Hopefully, it's useful. Sound intensity and level and Doppler Effect 37 Examples of Intensity and Sound Intensity Questions and the Doppler Effect and the answer. Complete. Image by Albrecht Fietz from Pixabay Collection of Sample Problems and Discussion of Sound Intensity and Levels 1. Sound has an intensity of 1 x 10⁻⁵ W/m². What is the intensity level in decibels (dB)? Wanted : Level of Intensity (dB) ? TI = 10 logs (10⁻⁵/ 10^-12) The intensity level in decibels (dB) is 70 dB It is known that a sound has an intensity of 10⁻⁴ W/m². What is the intensity level in decibels (dB)? Wanted : Level of Intensity (dB) ? TI = 10 logs (10⁻⁴ / 10⁻¹²) The intensity level in decibels (dB) is 80 dB 3. Sound has an intensity of 1 x 10^-9 W/m². What is the intensity level in decibels (dB)? Wanted : Level of Intensity (dB) ? TI = 10 logs (10^-9 / 10^-12) The level of intensity in decibels (dB) is 30 dB 4. The level of sound intensity in a room is 100 dB. What is the intensity of the sound in the room? .......x 10⁻² W/m² Wanted: Sound intensity (I) in the room? Intensity level (TI) = 10 log I/I₀ The sound intensity in the room is 1 x 10⁻² W/m² 5. Two sound waves have an intensity of 1 x 10⁻⁵ W/m2 and 1 x 10⁻⁴ W/m². The difference in intensity level in dB is… intensity 1 (I₁) = 1 x 10⁻⁵ W/m² intensity 2 (I₂) = 1 x 10⁻⁴ W/m² hearing intensity level (I₀) = 10⁻¹² W/m² Wanted: The difference in intensity level (TI) in dB? Intensity level (TI) = 10 log I/I₀ TI₁ = 10 logs (10⁻⁵/10⁻¹²) TI₂ = 10 logs (10⁻⁴/10⁻¹²) The difference in intensity level = 80 dB - 70 dB = 10 dB 6. Determine the ratio of the intensities of two sounds whose intensity levels are 10 dB and 40 dB. Wanted: Comparison of the intensity of the two sounds (I1: I2)? Comparison of the intensity of the two sound sources: 7. It is known that two sound waves are having an intensity of 1 x 10⁻⁷ W/m2 and 1 x 10⁻⁴ W/m2, respectively. The difference in intensity level in dB is… intensity 1 (I₁) = 1 x 10⁻⁷ W/m² intensity 2 (I₂) = 1 x 10⁻⁴ W/m² hearing intensity level (I₀) = 10⁻¹² W/m² Wanted: The difference in intensity level (TI) in dB? Intensity level (TI) = 10 log I/I₀ TI₁ = 10 logs (10⁻⁷/10⁻¹²) TI₂ = 10 logs (10⁻⁴/10⁻¹²) The difference in intensity level = 80 dB - 50 dB = 20 dB 8. The power generated from the sound of the Diesel engine at a distance of R is 10π watts and the intensity level of the sound heard is 70 dB. If the threshold intensity of sound Io = 10⁻¹² W/m² then calculates the distance R. Then the distance R is 500 meters. 9. A sound wave source with a power of 50 W radiates waves into a homogeneous surrounding medium. Determine the radiation intensity of the wave at a distance of 10 meters from the source... Wanted: intensity of radiation wave (I)? Sound intensity at distance r Then the radiation intensity of the wave (I) is 0.04 W/m² 10. The distance from A to the sound source is 3 times the distance from B to the sound source. The intensity of the sound received by A is compared to the intensity of the sound received by B is Wanted: intensity comparison? So the comparison of the intensity received by a and b is a 1: 9 11. If a sound is heard at a distance of 3 m from the source of the explosion with an intensity level of 50 dB, then at a distance of 30 m from the source of the explosion, a sound with an intensity level will be heard. 12. The intensity level of an average machine is 50 dB. If 100 machines are started at the same time, then the intensity level is... Answer: Sound intensity and level and Doppler Effect 1. One hundred identical sirens sounded simultaneous to produce a sound intensity level of 60 dB. If the threshold intensity of sound is 10-12 W/m2, then the intensity of a siren is... 2. The intensity level of a buzzing bee is 10 dB. If the buzzing sound of each bee is considered identical and the intensity of the human hearing threshold is 10-12 Wm-2, then the intensity of the buzzing sound of 1000 bees is... 3. The intensity level of a sound source at a distance of 9 m from the observer is 50 dB. If nine identical sound sources are added together, the total intensity level for the observer becomes... A wave that does not require a medium to propagate is called... 5. Which is the source of the sound? a) all objects can be a source of sound e) the table being hit or knocked 6.Points A and B are located at a distance of 4 m and 9 m from a sound source, respectively. If IA and IB are the sound intensities at point A and point B, respectively, then IA: IB is 7. The sound of a motorcycle horn when sounded produces an intensity level of 40 dB, while the sound of a car horn when sounded produces an intensity level of 60 dB. (Io = 10-12 W.m-2). If 100 motorcycle horns and 10 car horns are sounded simultaneously, then the ratio of the intensity level of a motorcycle to a car is... 8. The sound intensity of the sewing machine running is 10-9 Wm-2. For the sound intensity threshold of 10-12Wm-2, the sound intensity level of 10 identical sewing machines that are working is ..... 9. The intensity level of a sound source at a distance of 9 m from the observer is 50 dB. If nine identical sound sources are added together, the total intensity level for the observer becomes... 10. The sound intensity of the sewing machine running is 10-9 Wm-2. For the sound intensity threshold of 10-12Wm-2, the sound intensity level of 10 identical sewing machines that are working is ..... 11. The intensity level of a buzzing bee is 10 dB. If the buzzing sound of each bee is considered identical and the intensity of the human hearing threshold is 10-12 Wm-2, then the intensity of the buzzing sound of 1000 bees is 12. The sound of a motorcycle horn when sounded produces an intensity level of 40 dB, while the sound of a car horn when sounded produces an intensity level of 60 dB. (Io = 10-12 W.m-2). If 100 motorcycle horns and 10 car horns are sounded simultaneously, then the ratio of the intensity level of a motorcycle to a car is... 13. One hundred identical sirens sounded simultaneous to produce a sound intensity level of 60 dB. If the threshold intensity of sound is 10-12 W/m2, then the intensity of a siren is... 14. The sound intensity of the sewing machine running is 10-9 Wm-2. For the sound intensity threshold of 10-12 Wm-2, the sound intensity level of 10 identical sewing machines that are working is... 15. The level of sound intensity at a point caused by a sound source is directly proportional to... a) the inverse of the sound intensity at that point b) the reciprocal of the logarithm of the intensity at that point c) the logarithm of the ratio between the sound intensity and the threshold intensity of the sound d) threshold intensity of sound e) the intensity of the sound at that point 16. The greater the distance between the sound source and the listener, the higher the sound intensity 17. The distance of observer A to the source of the earthquake is twice the distance of observer B to the source of the earthquake. If the intensity of the earthquake at observer B is 8.2 x 10^4 W.m-2, it means that the intensity of the earthquake at A is... 18. The distance of observer A to the source of the earthquake is twice the distance of observer B to the source of the earthquake. If the intensity of the earthquake at observer B is 8.2 x 10^4 W.m-2, it means that the intensity of the earthquake at A is... 19. The sound of a motorcycle horn when sounded produces an intensity level of 40 dB, while the sound of a car horn when sounded produces an intensity level of 60 dB (Io = 10-12 W m-2 ). If 100 motorcycle horns and 10 car horns are sounded simultaneously, then the ratio of the intensity level of a motorcycle to a car is. 20. An instrument for measuring the level of sound intensity is measured by... 21. The sound intensity level in a room is 100 dB. What is the intensity of the sound in the room? .....x 10-2 W/m2. 22. Sound has an intensity of 1 x 10-9 W/m2. What is the intensity level in decibels (dB)? 23. The power generated from the sound of the Diesel engine at a distance of R is 10p watts and the intensity level of the sound heard is 70 dB. If the threshold intensity of sound Io = 10-12 Wm2 then calculates the distance R. 24. Calculate the intensity level of a sound source that has an intensity of I = 10-5 watts/m2 if the threshold intensity I0 = 10-12 watts/m2. 25. The power generated from the sound of the Diesel engine at a distance of R is 10p watts and the intensity level of the sound heard is 70 dB. If the threshold intensity of sound Io = 10-12 Wm2 then calculates the distance R. 26.A car engine produces a sound intensity level TI = 70 dB (Io = 10-12 watts/m2). For the sound of a car, an engine to produce an intensity level equivalent to the sound of an ambulance siren, how many car engines are needed. 27. A sound source has an intensity level of 50 dB at a distance of 9 m from the observer. If 9 identical sound sources are added together, calculate the intensity level of the sound heard by the observer. 28. At a distance of 1.5 meters from the source of the explosion a sound with an intensity level of 90 dB was heard. What is the intensity level of the sound heard at a distance of 150 m from the source? 29. The source of the sound and the listener are moving toward each other at the same speed of 20 m/s. If the listener hears the sound from a source with a frequency of 720 Hz and the speed of sound in air at that time is 340 m/s, then the actual source frequency is... 30. A sound source with a frequency of 680 Hz is moving at a speed of 20 m/s away from a stationary ear, near the listener is another sound source emitting a sound of frequency 644 Hz. If the speed of sound in air is 320 m/s, then the frequency of the sound received by the listener is... 31. A sound source with a frequency of 1400 Hz follows the listener away from it. If the speed of the listener is 100 m/s, the speed of the source of sound is 60 m/s, and the speed of sound is 340 m/s, then the frequency of the sound received by the listener is... 32. A window measuring 2 m x 3 m passes sound with an acoustic power of 0.6 W. If the threshold intensity is 10-16 W.cm-2, the intensity level that occurs in the window is... 33. A sound source has an intensity level of 17 dB. If there are 10 objects with the same intensity level, then sound simultaneous, then the resulting total intensity level is... 34. The intensity level of a window caused by noise on the highway is 80 dB. The power of sound entering a window with a window size of 1.2 m x 1 m is... 35. A bat flies towards a ripe mango on a tree. To confirm the position of the fruit, the bat emits ultrasonic waves with a frequency of 24 kHz. If the flying speed of the bat is 20 m/s and the speed of sound is 340 m/s, then the frequency of the mango fruit that the bat receives is... 36. If an engine has an intensity level of 20 dB, then when the intensity level becomes 30 dB, the number of similar machines running is... 37. The intensity level of a machine is 50 dB and the intensity level of lightning is 80 dB, then the ratio of the intensity of the sound of lightning to the machine is https://quizizz.com/admin/quiz/5e809ae5382421001dc0f5aa/effects-doppler-dan-taraf-intensitas-bunyi https://quizizz.com/admin/quiz/5e78325ccbef1e001bd820ee/intensitas-dan-taraf-intensitas-bunyi https://quizizz.com/admin/quiz/5c9eb7bd1c3dda001bcca014/intensitas-bunyi |