Aamc6r ps #34

[SaintJude]

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2 things given :

...The fundamental frequency of each string is 2/3 that of the next higher frequency

And frequency is proportional to square root of Tension

By what factor would a string's tension need to be changed to raise its fundamental frequency by a perfect fifth?

D. 9/4

I understand how they mathematically derived, but it doesn't make sense to me why they did this. What is the question talking about?