1. Determine the sum of the following sound levels (all in decibels): 68, 82, 76, 68, 74 and 81
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- A 5.75m high noise barrier is used to attenuate sound from a roadway adjacent to a residential subdivision. The height of the noise source is 1.25m and the height of the receiver is 2.25m. The distance from the noise source to the noise barrier is 22.00m. The distance from the noise barrier to the center of the rear yard of the residences is 11.00m. Determine the Path Length Difference in meters (accurate to 4 dec.pl.) that is created by the noise barrier.The speed of a sound in a rigid container with liquid of specific gravity of 0.998 is 1450 m/s. The coefficient of compressibility of the fluid is 4.766x10-4 GPa-1 No answer text provided. TRUE No answer text provided. FALSE10-5. A sound power level reading of 127 dB was taken near a construction site where chippers were being used. When all but one of the chippers stopped working, the sound power level reading was 120 dB. Estimate the number of chippers in operation when the reading of 127 was obtained. You may assume that the sources may be treated as ideal point sources located at the same point.
- A) What is the total sound pressure level of one person talking at 74db and a radio playing at 61 db? Be sure to show all work. Please specify the units as appropriate. B) A construction worker must operate a jackhammer, which generate 110db of noise, and drive a construction vehicle, which generate 80db of noise, for cement paving. Every hour of jackhammer operation only need half an hour of construction vehicle use. Without hearing protection, how much time should the worker operate the jackhammer and constructionvehicle a day according to the OSHA 1983 standard. Be sure to show all work. Please specify the units as appropriate.10-10. Using the typical noise spectrum for automobiles traveling at 50 to 60 km/h, determine the equivalent A-weighted level using sound power level addi- tion in a spreadsheet program you have written. The following band levels were estimated from Figure 10-25. Band center Band level frequency (Hz) (dB) 63 67 125 64 250 58 500 59 1,000 59 2,000 55 4,000 51 8,000 45A pumping machine in the water lifting station is found to produce a sound level of 50 dB. During the upgradation plan one more such machine will be added. What will be the combined noise level? O 71-90 dB 41-50 dB 51-70 dB 91-110 dB
- 10-14. The following noise record was obtained in the front yard of a home. Is this a relatively quiet or a relatively noisy neighborhood? Determine the equivalent continuous equal energy level. Time (h) Sound level (dBA) 0000-0600 42 0600-0800 45 0800-0900 50 0900-1500 47 1500-1700 50 1700-1800 47 1800-0000 45 Answers: It is a quiet neighborhood. Leg = 46.2, or 46, dBA %3DQuestion 6 Q6) In an attempt to verify if this law is obeyed by the light from a source the above setup was used. The light intensity I from the light bulb was recorded at various distance r and the observations are shown below. Ar +0.001 m Al= 10.1 W/m2 %3D r(m) 0.400 0.500 0.600 0.700 0.800 I(W/m2) 88.2 56.5 38.2 32.1 22.1 1 (m-2) The theory indicates that the light intensity and the distance are related through the equation: 4tr2 Where P is the power emitted by the source. a) Complete the data table b) Plot the graph of I vs 1/r? c) Determine the slope and the intercept of the graph d) Does the light intensity obey inverse square law? e) Find the power of the source from the slope and compare with the given value of 60 Watts. HTML Editor B IUA A I E E E E x ...A 4.50m high noise barrier results in a Path Length Difference of 1.4855m. Calculate the Fresnel Number (N accurate to three decimal places) for this scenario if the noise has a frequency of 900 hertz.
- Question-01: (CLO3) (10)A differential manometer is connected to two water tanks initially filled up to same level and open to the atmosphere. In this condition the top water surface in the tank is 150 cm higher than the mercury level in the right limb of differential manometer. Calculate and Show the new mercury level difference in the two limbs of differential manometer if the water in the left tank is replaced by oil of Specific gravity 0.7The hourly average sound level for a community noise is 60 dBA from 7 A.M. to 7 P.M., 55 dBA from 7 P.M. to 10 P.M., and 50 dBA from 10 P.M. to 7 A.M. Find (a) Leg for the 24 hours, (b) Lân, and (c) CNEL.The sound level for a jet plane on the ground with sound pressure of 2000 µ bar should be (a) 60 dB (c) 140 dB (b) 100 dB (d) 180 dB