What is the benefit of using the metric system and SI Units? A. so that all measurement systems can be used together. B. there is no need to use the same system of measurements around the world. C. to convey information accurately so scientists can refer to the same quantity no matter the location or language. D. to measure accurately on equipment

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.