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The energy E left( overrightarrow bf k right) &nbsp of electrons...

This question belongs to Engineering Physics Solid State Physics
Solid State Physics
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The energy $$E\left( {\overrightarrow {\bf{k}} } \right)$$  of electrons of wave vector $$\overrightarrow {\bf{k}} $$ in a solid is given by $$E\left( {\overrightarrow {\bf{k}} } \right) = A{k^2} + B{k^4},$$    where A and B are constants. The effective mass of the electron at $$\left| {\overrightarrow {\bf{k}} } \right| = {k_0}$$  is

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Correct Answer: Option C
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