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The length of a sonometer wire is 0.75 m...

The length of a sonometer wire is 0.75 m and density is 9 `xx` `10^3` kg/`m^3`. It can bear a stress of 8.1 `xx` `10^8` N/`m^2` without exceeding the elastic limit. Then the fundamental frequency that can be produced in the wire is

A

200 Hz

B

400 Hz

C

300 Hz

D

100 Hz

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