A) 274.4 Hz
B) 744.2 Hz
C) 44.72 Hz
D) 447.2 Hz
Correct Answer: D
Solution :
Mass per unit length \[m=\frac{2\times {{10}^{-4}}}{0.5}kg/m\]\[=4\times {{10}^{-4}}kg/m\] Frequency of 2nd harmonic \[{{n}_{2}}=2{{n}_{1}}\] \[=2\times \frac{1}{2l}\sqrt{\frac{T}{m}}\]\[=\frac{1}{0.5}\sqrt{\frac{20}{4\times {{10}^{-4}}}}=447.2Hz\]
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