Physics
posted by Scott on .
If the seventh and fourth standing wave frequencies of a string differ by 144 Hz, what is the fundamental frequency of the string?

the fourth standing wave frequency is 4*f1, where f1 is the fundamental wave frequency. The seventy fundamental frequency is 7*f1
7*f1  4*f1 = 3*f1 = 144 hz
f1 = 144/3 
This is not correct. The answer is simply as follows:
Let f* be the fundamental frequency.
Then f*[(1/4)(1/7)]=144Hz.
f* = 1344 Hz