In a direct band gap material, an electron in the conduction band having a crystal momentum of 7 84 10 26 Kg m s makes a transition to the valence band emitting an electromagnetic wave of wavelength 0 8 m Calculate the band gap energy Assume that the effective mass of an electron in the conduction band is 0 07m and that in the valence band is 0 5m, where m is the electron rest mass Assume parabolic conduction and valence band

Question: In a direct band-gap material, an electron in the conduction band having a crystal momentum of 7.84 10 26 Kg m/s makes a transition

In a direct band-gap material, an electron in the conduction band having a crystal momentum of 7.84 × 10⁻²⁶ Kg⋅ m/s makes a transition to the valence band emitting an electromagnetic wave of wavelength 0.8 μm. Calculate the band-gap energy. Assume that the effective mass of an electron in the conduction band is 0.07m and that in the valence band is 0.5m, where m is the electron rest mass. Assume parabolic conduction and valence band?

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