SamanthaSamLO4
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The document discusses sound intensity and level calculations related to construction noise. It provides: 1) The sound intensity level is 70dB for a listener 10m from a house under construction. The sound intensity is calculated as 10-4 W/m2. 2) The power radiated by the construction is 0.126W. 3) At 20m, the sound intensity would be 2.51x10-5 W/m2 and sound intensity level would be 55.3dB. 4) It would take 100 houses under construction to equal a sound intensity level of 90dB.
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LO4: The decibel scale
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3) Doubling the number of identical sound sources increases the total sound intensity by approximately 3dB.
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1) Having two sound sources producing sound does not mean the total sound intensity doubles.
2) If a single chainsaw 1m away produces 110dB, two chainsaws together would produce around 113dB, not 220dB as one may initially think.
3) Doubling the number of identical sound sources increases the total sound intensity by approximately 3dB.
Physics lo. 2
1) Having two sound sources producing sound does not mean the total sound intensity doubles.
2) If a single chainsaw 1m away produces 110dB, two chainsaws together would produce around 113dB, not 220dB as one may initially think.
3) Doubling the number of identical sound sources increases the total sound intensity by approximately 3dB.
Physics LO 2
1) Having two sound sources producing sound does not mean the total sound intensity doubles.
2) If a single chainsaw 1m away produces 110dB, two chainsaws together would produce around 113dB, not 220dB as one may initially think.
3) Doubling the number of identical sound sources increases the total sound intensity by approximately 3dB.
Physics lo. 2
1) Having two sound sources producing sound does not mean the total sound intensity doubles.
2) If a single chainsaw 1m away produces 110dB, two chainsaws together would produce around 113dB, not 220dB as one may initially think.
3) Doubling the number of identical sound sources increases the total sound intensity by approximately 3dB.
Physics LO. 2
1) Having two sound sources producing sound does not mean the total sound intensity doubles.
2) If a single chainsaw 1m away produces 110dB, two chainsaws together would produce around 113dB, not 220dB as one may initially think.
3) Doubling the number of identical sound sources increases the total sound intensity by approximately 3dB.
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How to Build a Module in Odoo 17 Using the Scaffold Method
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Chapter 4 - Islamic Financial Institutions in Malaysia.pptx
Azure Interview Questions and Answers PDF By ScholarHat
Azure Interview Questions and Answers PDF By ScholarHat
SamanthaSamLO4
- 1. Wave and Oscillations Sound Waves Physics 101 LO4
- 2. You are standing 10 meters away from a House that is under construction the sound intensity level from where you are is 70dB. Intensity 10 meters 1
- 3. What is the sound intensity of the construction? Hint: I (dB)b=10log10[I/I0] b(dB)=intensity level I0=1x10-12 W/m2 (is a constant) I=? Answer: version a)I/I0=10-12(1070/10) I=10-4 W/m2 version b) 70=10log10[10-4/10-12] I=10-4 W/m2 Question 1a)
- 4. How much power is the construction radiating? Hint: use the formula P=I4(pi)r2 Answer: P=10-44(pi)102 P=0.126W Question 1b)
- 5. What would the sound intensity and sound intensity level(dB) be if you doubled the distance? Hint: Answer: I=P/(4(pi)r2) I=0.126/(4(pi)202) Sound intensity I=2.51x10-5 b = 0dB+ 10log((2.51x10-5)/(10-12))=55.29 Sound intensity leveldB=55.3 Question 1c)
- 6. How many houses under construction can you add to equal 90dB? Answer: b(90)-b(70)=20dB I/I0=107 I’/Io=109 log10(I’/I)=2 I’/I=102 I’=10^2I 100 times more construction to meet the 90dB of sound intensity. Question 1d)