Aloudspeaker is placed between two observers who are 125 apart, alonq the line connecting them. if one observer (observer a) records a sound level of 55 db and the other (observer b) records a sound level of 85 db, how far is the speaker from each observer? m (from observer a) m (from observer b)

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?