Question: A 1.6-m-long string fixed at both ends vibrates at resonant frequencies of 780 Hz and 1040 Hz, with no other resonant frequency between these values.

A 1.6-m-long string fixed at both ends vibrates at resonant frequencies of 780 Hz and 1040 Hz, with no other resonant frequency between these values.
(a) What is the fundamental frequency of this string?
(b) When the tension in the string is 1200 N, what is the total mass of the string?

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