Guitar strings are tuned to 6 frequencies by selecting the string material's mass/length and adjusting the tension in the string.    1 (E) 329.63 Hz E4 2 (B) 246.94 Hz B3 3 (G) 196.00 Hz G3 4 (D) 146.83 Hz D3 5 (A) 110.00 Hz A2 6 (E) 82.41 Hz E2   On each string, the frequency of the played note is altered by depressing the string against a fret.  Each fret changes the frequency by a factor of 21/1221/12 such that with 12 of these steps the frequency is altered by 2.  At which fret would the G string be depressed to give a frequency of middle C, the same as the resonant frequency of this flute?

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Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.