- A heat engine has a hot reservoir with a temperature 23 degrees * C and a cold reservoir with a temperature of 10 degrees * C . Find the maximum possible efficiency for such an engine. A 56.5 % B 0.565% C 4.4 % D 0.044 %

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.