In order to maintain optimal community health, the best plan for communities would be to
a.
decrease vaccinations and research new treatments and cures
b.
create laws that control public behavior, like hand washing and blowing your nose
c.
provide community support to elders who are sick and need healthcare treatment
d.
provide health services and regulate food and water supplies

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.