The D-string on a properly tuned guitar produces a tone with a fundamental frequency of 146.8Hz . The length of the oscillating portion of a D-string on a certain guitar is 0.616m . This same length of string is weighed and found have a mass of 1.47103kg . show answer Correct Answer 25% Part (a) At what tension, in newtons, is the D-string properly tuned? FT = 78.00 N Correct! show answer Correct Answer 25% Part (b) What is the wavelength, in meters, of the standing wave in the D-string when it is oscillating at its third harmonic, which is also called its second overtone? 3 = 0.4100 m Correct! show answer Correct Answer 25% Part (c) Determine the frequency, in hertz, of the third harmonic of the tone produced by the properly tuned D-string. f3 = 440.4 Hz Correct! show answer Incorrect Answer 25% Part (d) The guitarist shortens the oscillating length of the properly tuned D-string by 0.118m by pressing on the string with a finger. What is the new fundamental frequency, in hertz, of the shortened string