Two identical straight wires are stretched so as to produce $6$ beats per second when vibrating simultaneously. On changing the tension 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 change in tension  
  • A${T_2}$ was decreased
  • B${T_2}$ was increased
  • C${T_1}$ was increased
  • D${T_1}$ was kept constant
IIT 1991, Medium
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