Explain that energy of a hole farther from the top of a valence band is high.
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To understand it, consider an electron is removed from the filled valence band to the bottom of the empty conduction band. This creats a hole in the valence band. Since more energy is required to remove another electron which is farther from the top of the valence band, therefore, a hole in the valence state farther from the top of the valence band has higher energy, just as a conduction electron farther from the bottom of the conduction band has higher energy.
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