If one-half of the members of a symphony orchestra are absent because of head colds,thus reducing the overall intensity of sound by 50%,what will be the reduction in the decibel level?
A) 17.0 dB
B) 20.0 dB
C) 6.9 dB
D) 3.0 dB
E) 6.9 dB
Correct Answer:
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