Answer:
Tension, T = 0.556 N
Step-by-step explanation:
It is given that,
Length of vocal cords, l = 22 mm = 0.022 m
Mass per unit length,

We need to find the tension is required in the vocal cords in order to produce a tone of middle C of frequency 261.62 Hz. The frequency in terms if tension is given by :

T = tension in the vocal cords

So, the tension in the vocal cords is 0.556 N.