My notes ask your teacher +-/1 points serpse10 17.7.op.029. two loudspeakers placed next to each other each emit a pure tone with the same amplitude. one speaker emits a tone with a frequency of 577.0 hz, the other with a frequency of 570.0 hz. a distant listener perceives a pure tone that has a single frequency, but varies in loudness with a perceived "beat." (a) what is the frequency (in hz) of the pure tone perceived by the listener? (round your answer to at least the nearest integer) (b) what is the best frequency (in hz) perceived by the listener? need ? read it