- Communication Systems - Section 1
- Communication Systems - Section 2
- Communication Systems - Section 3
- Communication Systems - Section 4
- Communication Systems - Section 5
- Communication Systems - Section 6
- Communication Systems - Section 7
- Communication Systems - Section 8
- Communication Systems - Section 9
- Communication Systems - Section 10
- Communication Systems - Section 11
- Communication Systems - Section 12
- Communication Systems - Section 13
- Communication Systems - Section 14
- Communication Systems - Section 15
- Communication Systems - Section 16
- Communication Systems - Section 17
- Communication Systems - Section 18
- Communication Systems - Section 19
- Communication Systems - Section 20
- Communication Systems - Section 21
- Communication Systems - Section 22
- Communication Systems - Section 23
- Communication Systems - Section 24
- Communication Systems - Section 25


Communication Systems - Engineering
Q1: For a good public address system the sound intensity at the farthest point should be at leastA
20 dB over threshold of hearing
B
40 dB over threshold of hearing
C 80 dB over threshold of hearing
D
120 dB over threshold of hearing
ANS:C - 80 dB over threshold of hearing Noise that is 100 db at one meter will have an intensity of only 1/100 as much at ten meters. That's 2 bels, or 20 decibels less, since a bel corresponds to a factor of ten. So at 10 meters the sound is 80 db. At 100m the intensity is down to 60 db. |


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