How are the momentum energy and wave speed interrelated

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Reference no: EM131361202

The oscillations for a phonon traveling in the positive x direction can be approximated by a plane wave, y = A cos(kx - ωt), where A is the amplitude, k = 2π/λ is the wave number, and ω = 2π/T is the angular frequency.

(a) What is the speed of this phonon, c_s, in terms of ω and k?

(b) If the momentum and energy are given by p = hk and ε = hω, how are the momentum, energy, and wave speed interrelated?

Reference no: EM131361202

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