Two identical straight wires are stretched so as to produce 6 beats per second when vibrating simult

Question

Two identical straight wires are stretched so as to produce 6 beats per second when vibrating simultaneously. On changing the tension slightly in one of them, the beat frequency remains unchanged. Denoting by $T_{1}, T_{2}$ the higher and the lower initial tensions in the strings, then it could be said that while making the above changes in tension,\

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(b, c) : The frequency of stretched string $f=\frac{1}{2 l} \sqrt{\frac{T}{\mu}}$\ Since $T_{1}>T_{2} 	herefore f_{1}>f_{2}$\ $	herefore \quad$ Initially $f_{1}-f_{2}=6$\ Finally, beats $=6$\ This is possible when $f_{2}$ increases and $f_{1}$ decreases.\ $	herefore \quad$ When $T_{2}$ increases and $T_{1}$ decreases.\