Question
A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of
-
1000
-
10000
-
10
-
100
Solution
D.
100
A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of
1000
10000
10
100
D.
100
Give three reasons why the modulation of a message signal is necessary for long-distance transmission.
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