Concept explainers
At a rock concert, a dB meter registered 130 dB when placed 2.5 m in front of a loudspeaker on stage.
(a) What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air?
(b) How far away would the sound level be 85dB?
(a)The power output of the speaker
(b)The intensity level of
Answer to Problem 9P
Solution:
(a)The power output of the speaker will be
(b)The intensity level of will be
Explanation of Solution
Given:
(a)To determine the power output of the speaker
Where,
=sound level
=intensity
=power per unit
(b)The determine the intensity level of
put
Therefore
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