LOTS OF NOISE III You are standing in the middle of a large room listening to a
ID: 1783587 • Letter: L
Question
LOTS OF NOISE III
You are standing in the middle of a large room listening to a cacaphony of sounds. Rank the intensity level of the sounds from each source (1=loudest, 2= next loudest, ...) Consider all objects to be right next to you. (Remember that if you have a tie, you skip some ranks.) If two values are within 0.1 dB from each other, consider them to be the same.
1 2 3 4 Four buzzers each producing a sound with intensity level of 71dB.
1 2 3 4 An object emitting a sound with an intensity of 80dB.
1 2 3 4 Two buzzers each producing a sound with intensity level of 76dB.
1 2 3 4 Ten buzzers each producing a sound with intensity level of 68dB.
Explanation / Answer
Item1 : Each buzzer of 71 Db
number of buzzers = 4
Total sound intensity = 10 Log[ 10^(71/10) + 10^(71/10) + 10^(71/10) + 10^ (71/10)]
= 10 [ log 4 + 7.1 log 10] = 77 db
Item2:
Intensity of sound object = 80db
Item3:
2 buzzers each 76 db
Total sound intensity = 10log[ 10^(76/10) + 10^(76/10)] = 10 [ log ( 2 X log 10^(7.6)]
= 79db
Item4:
Ten buzzers 68db each
Total intensity = 10 log[ 10X 10^(68/10)]
= 78 db
Item 2 is loudest 80db
item 3 is next loudesr at 79db
item 4 at 78db is the next loudest
item 3 at 77 db is the lowest intensity.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.