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201.

The tension in a wire is decreased by `19%` The percentage decrease in frequency will beA. 0.81B. 0.0019C. 0.1D. 0.019

Answer» Correct Answer - C
`T_2 = 81/100T_1`
`n_2/n_1 = sqrt(T_2/T_1) = sqrt(81/100) = 9/10`
`(n_1-n_1)/(n_1) = (9-10)/(10) = (-1)/(10) = 10%`
Discussion
202.

If the tension in a wire is decreased by 9% , then the percentage decrease in frequency will beA. 0.1B. 0.045C. 0.09D. 0.019

Answer» Correct Answer - B
`(Deltan)/(n)= 1/2 (DeltaT)/(T) = (1)/(2) 9% = 4.5%`
Discussion