Assume that a loudspeaker broadcasts sound equally in alldirections and produces sound with a level of 109 dB at a distance of 1.66m from the center.
(a) Find its sound power output.
W
(b) If the salesperson claims to be giving you 170 W per channel, he is referring to the electricalpower input to the speaker. Find the efficiency of the speaker --that is, the fraction of input power that is converted into usefuloutput power.
%