Time Time 11. Hai is playing guitar. a, How can he change the loudness of musical notes? b, How does the oscillation and amplitude of the strings change when Hai strums stronger or weaker? c, How is the oscillation of the guitar strings when he plays high-note and low- note?

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.