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Two identical strings are stretched at tensions `T_A` and `T_B`. A tuning fork is used to set them in vibration. A vibrates in its fundamental mode and B in its first overtone mode, then
A. |
`T_A=2T_B` |
B. |
`T_A=4T_B` |
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C. |
`2T_A=T_B` |
D. |
`T_A=T_B` |