A String 2 $\times$ 10^-2 Kg

Multiple Choice

A string 2.0 m long has a mass of 2.4 $\times$ 10^-2 kg.When fixed at both ends,it vibrates with a fundamental frequency of 150 Hz.The frequency of the third harmonic of this fundamental is

A) 50 Hz
B) 75 Hz
C) 0.15 kHz
D) 0.45 kHz
E) 1.1 kHz