Created by StemPy LabA student measures the resistance of a thermistor made of a semiconductor and of a copper wire, first in a cold bath and then in a warm bath. How do the two resistances change when the bath is warmed?
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← 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?Silicon is doped with donors, 4.0 × 10²⁰ in each cubic metre. At room temperature ni = 1.0 × 10¹⁶ m⁻³. Assume that every donor gives one electron. How many holes are there in each cubic metre? →
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