Two identical straight wires are stretched so as to produce 6 beats/sec. when vibrating simultaneously. n changing the tension slightly in one of them , the beat frequency remains unchanged. Denoting by T 1 , T 2 , the higher & 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, d)
Fundamental frequency of wave in wire. n = 
here beat frequency = n 1 – n 2 = 
beat frequency remain same
T 2 could be increased or T 1 could be decreased
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