A trumpet creates a sound intensity level of1.05Â Â 102 dB at a distance of 0.80 m.
(a) What is the sound intensity of a trumpet at thisdistance?
W/m2
(b) What is the sound intensity of five trumpets at thisdistance?
W/m2
(c) Find the sound intensity of five trumpets at the location ofthe first row of an audience, 7.60 m away, assuming, forsimplicity, the sound energy propagates uniformly in alldirections.
W/m2
(d) Calculate the decibel level of the five trumpets in the firstrow.
dB
(e) If the trumpets are being played in an outdoor auditorium, howfar away, in theory, can their combined sound be heard?
m
(f) In practice such a sound could not be heard once the listenerwas 2-3 km away. Why can't the sound be heard at the distance foundin part (e)? Hint: In a very quiet room the ambient soundintensity level is about 30 dB.
