The average velocity of the entire trip is given by Eq. 4-8, vavg  r / t, where the total displacement r  r  r  r 123
is the sum of three displacements (each result of a constant velocity during a given time), and t  t1  t2  t3 is the total
amount of time for the trip. We use a coordinate system with +x for East and +y for North.

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.