What do you call the period between two full moons

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

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The fine detail of saturn's rings provides evidence that the planet may be: a. young b. millions of years old c. in a state of growing larger