a string attached to a 60.0 Hz vibr. ator creates a standing wave with 5 loops. What frequency would make 7 loops? (Unit = Hz)

F=84.0 Hz

Explanation:

Using the equation f= n (v/2L),  frequency equals number of loops times velocity over 2 times the length, in order to get 60.0 Hz of frequency from 5 loops, v/2L would have to equal 12. (12*5=60) v/2L is constant, so to find the frequency of 7 loops you would times 7 by 12 to get 84.0.

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b. a lightning bug, plug of grass, and a worm