Question

Explain why stringed instruments are provided with strings of different thickness.

Answer 1

Frequency produced in the string $\nu =\frac{n}{2L}\sqrt{\frac{T}{\mu }}$

where $T$ and $\mu$ are the tension in the string and mass per unit length of the string, respectively.

Strings of different thickness have different $\mu$ and different tension is produced in each string resulting in the production of different frequencies.

Hence stringed instruments are provided with strings of different thickness.