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Choose the correct alternative. : If a ...

Choose the correct alternative. :
If a tuning fork is made up of material-brass and another tuning fork is made up or material-steel, then,

A

length of two tuning forks must be different.

B

size of two tuning forks must be different.

C

sound produced by two tuning forks will be of different frequency.

D

All of th above.

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