The effective density of states of undoped GaAs at 300 K is in the conduction band NC= 4.7x1017 cm-3 and in the valence band NV=7.0x1018 cm-3. Calculate the effective mass of electrons and holes normalized to the mass mo of a free electron (9.1x10-31 kg). (h=6.63x10-34 Js)

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