Created by StemPy LabIn a pure crystal of germanium at room temperature, an electron leaves the valence band and moves into the conduction band. What stays behind in the valence band, and how does it behave?
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← A chemist adds a tiny amount of arsenic to a crystal of pure silicon. Arsenic is in group 15, so each of its atoms has five outer electrons. Four of them join the bonds of the neighbouring silicon atoms. What does the crystal become?A violet light-emitting source gives out photons of energy 3.2 eV, which is the gap of the crystal inside it. A student wants the wavelength of this light. Use hc = 1240 eV nm. What wavelength does the student find? →
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