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Ten cars in a circle at a boom box competition produce a
Chapter 17, Problem 23(choose chapter or problem)
Problem 23PE
Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?
Questions & Answers
QUESTION:
Problem 23PE
Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?
ANSWER:Solution 23PE
If a source is emitting sound of some intensity then n number of sources emitting sound of same intensity will definitely cause increase in sound intensity and intensity emitted by identical sources will be
times of the single source if interference is not considered.
The expression to find the intensity level of sound produced by 10 cars is,
= (10 d
)
Substitute, 120 dB for and
for
in the expression of intensity level of sound,
120 dB = (10 dB) (
)
=
(