67. in a crystalline solid, the energy band structure (e-k relation for an electron of mass mis given by hk(2k-3) the effective 2m mass of the electron in the c

67. In a crystalline solid, the energy band structure (E-k relation for an electron of mass mis given by hk(2k-3) The effective 2m mass of the electron in the crystal is 2 B. m 3 A. m m C. 2 D. 2 m the