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a
Long hack - saw blade which is fixed at one end produce less number of oscillations up on plucking and produce shrill sound
b
Small hack - saw blade which is fixed at one end produce more number of oscillations up on plucking and produce shrill sound
c
Long hack - saw blade which is fixed at one end produce more number of oscillations up on plucking and produce flat sound
d
Small hack - saw blade which is fixed at one end produce less number of oscillations up on plucking and produce shrill sound
answer is B.
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