- #1
mamela
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Dispersion Relation:
w2=B(1/m+1/M)+-SQRT[(1/m+1/M)2-(4sin2ka/mM)]
For waves on a diatomic row of masses, what is the physical meaning of acoustic and optical branches of this dispersion relation? What is the expression for the maximum frequency of the optical branch?
Really stuck on this question and can't find ANYTHING on the internet!
Please help!
w2=B(1/m+1/M)+-SQRT[(1/m+1/M)2-(4sin2ka/mM)]
For waves on a diatomic row of masses, what is the physical meaning of acoustic and optical branches of this dispersion relation? What is the expression for the maximum frequency of the optical branch?
Really stuck on this question and can't find ANYTHING on the internet!
Please help!