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B)What should the tension in the wire be if the beats are to disappear?

for part A i have calcuated

u=7.55e-3 and velocity along the string which is v=159 m/s

what i am thinking of doing is the following:

i know my beat freq. is 5.20 Hz. I also know that

Freq.b = Delta w/2pi

i am thinking of rearanging to find w and then pluging everything into:

F= 1/2pi * srt w

that may give me one frequency of the tunning frok and then from here i take the frequency from my answer and then minus my beat frequency from it giving me my other frequency.

Is this what i have to do??

and for B) im not really sure how to approach it any hints?