Question

The effective mass of the solid whose energy expression varepsilon(k)=A-B cos(k_(+-)b)cos(k b) near (0 0) is equal to (a) (h^(2))/(Bb^(2)) (i) (b) (pi^(2))/(2Bb^(2)) (d) (h^(2))/(Bb^(3))

Answer 1

Answer:

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