A geologist wants to predict flow rates of the river coming down the mountain in the topographic map. What is the approximate drop in elevation between point X and point Y? A. 20 m

B. 40 m

C. 60 m

D. 80 m

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?