A string (mass 4.7 g, length 2.96 m, and tension 73.8 N), fixed at both ends, vibrates in its second (n = 2) natural mode. What is the wavelength in air of the sound emitted by this vibrating string? The speed of sound in air is 340 m/s. Answer in units of m.
I've tried it and got it wrong. Could someone please help me out?