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Consider the propagation of a T-waves along a linear array of peroidic atoms each of mass m and equilibrium separation a. IfT

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Answer #1

The frequency is given by

f=\frac{\sqrt{\frac{T}{\frac{m}{L}}}}{2L}

f=\frac{\sqrt{\frac{TL}{m}}}{2L}

f={\sqrt{\frac{TL}{m4L^{2}}}}

f={\sqrt{\frac{T}{m4L}}}

f=\sqrt{\frac{15}{4*6*10^{-26}}}

f=\sqrt{62.5*10^{24}}

f=7.906*10^{12}Hz

then angular frequency is

w=2\pi f

w=2\pi *7.906*10^{12}

w=50*10^{12}Hz

option (D) is right

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