W m2 to db
[DOC File]CHAPTER 2 Giancoli: Physics
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Sound Intensity (I) is measured in units of W/m2. The reference intensity I. o is 10-12 W /m2 . Intensity level ( is measured in dB ( = 10 log (I/ I. o) Standing wave on a string: (n = 2 L/n. The wavelength is related to the frequency by v = f (Doppler Effect: A source sends out sound of frequency = f. The source is moving towards. the observer ...
[DOC File]CP7e: Ch. 14 Problems
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Two sounds have measured intensities of I1 = 100 W/m2 and I2 = 200 W/m2. By how many decibels is the level of sound 1 lower than that of sound 2? 13. A noisy machine in a factory produces sound with a level of 80 dB. How many identical machines could you add to the factory without exceeding the 90-dB …
[DOC File]Physics Worksheet – Unit 4 - Georgetown ISD
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How much power is radiated as sound from a band whose intensity is 1.6 x 10-3 W/m2 at a distance of 15 m? The power output of a tuba is 0.35 W. At what distance is the sound intensity of the tuba 1.2 x 10-3 W/m2. When the decibel level of traffic in the street goes from 40 to 60 dB, how much greater is the intensity of noise? (hint: page 490)
[DOCX File]I.E. SANTA TERESA DE JESUS
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Io = 10 -12 W/m2 . 12. Una fuente sonora puntual emite una potencia de 10-6 W. a) Determine el nivel de intensidad expresado en dB a 1 m de la fuente sonora b) ¿A qué distancia de la fuente sonora el nivel de intensidad se ha reducido a la mitad? 13. El nivel de intensidad sonora de la sirena de un barco es de 60 dB a 10 m de distancia.
[DOC File]Chapter 2
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I = 1 x 10-3 W/m2; = 90 dB *22-46. The noon whistle at the textile mill has a frequency of 360 Hz What are the frequencies heard by the driver of a car passing the mill at 25 m/s on a day when sound travels at 343 m/s? Approaching: ; f0 = 386 Hz. At same point as source: f0 = 360 Hz.
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A very loud train whistle has an acoustic power output of 80 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 100 meters from the train? (I0 = 10(12 W/m2) (a) 78.3 dB. 95.0 dB. 92.8 dB. 88.0 dB. 75.0 dB. A buzzer with frequency f0 is thrown straight upwards.
[DOC File]PHY2464 Homework Solutions –Chapter 1
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From Table 5.2, 1000 W/ m2 => 150 dB. Or calculate it: I/Io = 103/10-12 = 1015 ; SIL = 10 log 1015 = 10 (15) = 150 dB. 8. Each added violin increases Io by one more, hence 3 violins => 3Io, etc. So [using Table 5.1 ] 3 violins => I/Io = 3 => 75 dB + 5 dB = 80 dB; 5 violins => I/Io = 5 => 75 dB + 7 dB = 82 dB ; Similarly, 10 violins => 10 => 85 dB
[DOC File]General Physics – ph 211 - Home | LBCC
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What is the intensity level of a sound with intensity 10-3 W/m2? A) 60 dB B) 90 dB C) 30 dB D) 96 dB. The decibel is a unit of . A) amplitude. C) wavelength. B) loudness. D) frequency. How tall must a plane mirror be in order for you to be able to see your full image …
[DOC File]Marine Institute of Memorial University of Newfoundland
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The threshold of human hearing is 1.0 × 10-12 W/m2. A) 18 dB. B) 23 dB. C) 28 dB. D) 32 dB. Answer: C. Var: 1. 12) A barking dog delivers about 1.0 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level in decibels at a distance 5.00 m from the dog? The threshold of human hearing is 1.0 × 10 ...
[DOC File]SOUND HW 1 Answer
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Each 10 dB is twice as loud, so four times as loud. Each 10 dB is ten times the intensity so 100 times as intense. 5. A certain microphone placed in the ocean is sensitive to sounds emitted by dolphins. To produce a usable signal, sound waves striking the microphone must have a decibel level of 10 dB (1 * 10 -11 W/m2 ) .
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