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

true is the correct answer

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answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.