In: Physics
A trumpet creates a sound intensity level of 1.05 102 dB at a distance of 0.80 m.
(a) What is the sound intensity of a trumpet at this
distance?
W/m2
(b) What is the sound intensity of five trumpets at this
distance?
W/m2
(c) Find the sound intensity of five trumpets at the location of
the first row of an audience, 7.60 m away, assuming, for
simplicity, the sound energy propagates uniformly in all
directions.
W/m2
(d) Calculate the decibel level of the five trumpets in the first
row.
dB
(e) If the trumpets are being played in an outdoor auditorium, how
far away, in theory, can their combined sound be heard?
m
(f) In practice such a sound could not be heard once the listener
was 2-3 km away. Why can't the sound be heard at the distance found
in part (e)? Hint: In a very quiet room the ambient sound
intensity level is about 30 dB.
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