Solve the all parts of given problem:
Problem: A guitar string is 75.0 cm long and has a mass of 8.75 g. The speed of sound is 344 m/s in the room in which the guitar is being played. The guitarist wants to produce a sound of wavelength 3.35 cm when the string vibrating in its third harmonic.
Part A: To what tension must he adjust the string?
Part B: In its fundamental mode of vibration, what is the frequency of the sound produced by the guitar?
I need help to find the frequency of the sound produced by the guitar.