Sinusoidal waves 6 cm in amplitude are to be transmitted along a string that has a linear mass density of $\;4 \times 10^{-2} Kg/m\;$ . If the source can deliver a maximum power of 400 W and the string is under a tension of 100 N , what is the highest vibrational frequency at which the source can operate

Question

$(a)\;38\;s^{-1}\qquad(b)\;6.5\;s^{-1}\qquad(c)\;38.5\;s^{-1}\qquad(d)\;37.5\;s^{-1}$