A stereo speaker is placed between two observers who are 31 m apart, along the line connecting them. If one observer records an intensity level of 55 dB, and the other records an intensity level of 81 dB, how far is the speaker from each observer

Answer the radiant sun;

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.