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What is the speed of a wave on this carbon nanotube?

A single carbon nanotube with a cross sectional diameter of just 2.5 nanometers.  It is suspended over a trench of width W=1.5 micrometers.  The cornell researcher authors of this paper reported a fundamental (n=1) frequency of this system:  f=55Mhz.  What is the speed of a wave on this carbon nanotube?

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