Using the upper and lower limb diagram, what pair of organisms would be considered having homologous structures? What pair of organisms would be considered having analogous structures?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?