Question

A trumpet creates a sound intensity level of 112 dB at a distance of 2.75 m. (a) What is the sound intensity of a trumpet at this distance. (b) What is the sound intensity of seven trumpets played simultaneously at this distance? (c) Calculate the sound intensity level of the seven trumpets played simultaneously at this distance.

Answer 1

$l_1=\frac l{\lg B}=1.4~m.$