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Semiconductors: Assessments
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<font size="5" color="#FFFFFF">Assessment</font>
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<strong>1. Under which condition can we expect the highest concentration
of electron holes in a semiconductor? </strong>
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<html>A P-type semiconductor at high temperature </html>
<html>A P-type semiconductor at low temperature</html>
<html>An N-type semiconductor at high temperature</html>
<html>d. An N-type semiconductor at low temperature</html>
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<strong>2. In a semiconductor explain why electrons travel in a different
direction than electron holes. </strong>
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<strong>3. In which direction will the hole in this image move?</strong>
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<html>It can't move</html>
<html>Left</html>
<html>Right</html>
<html>Down</html>
<html>Randomly</html>
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<strong>4. Arsenic is commonly used to dope silicon. Arsenic’s electron
configuration suggests that contains 5 electrons in its outermost shell
(called the valence shell). What type of a silicon semiconductor could be
created with this element? </strong>
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<html>N-Type </html>
<html>P-type </html>
<html>Both N-type and P-type can be made with this element </html>
<html>Arsenic would not be well suited for doping silicon semiconductors </html>
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<strong>5. The element tin (Sn) has an electron configuration suggesting 4
electrons in its outermost shell. What type of semiconductor would this
element be suited for manufacturing? </strong>
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<html>N-Type </html>
<html>P-type </html>
<html>Both N-type and P-type can be made with this element </html>
<html>Sn would not be well suited for doping silicon semiconductors </html>
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<img src="Germanium_semiconducto.PNG">
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<strong>6. What type of silicon semiconductor is being depicted in this
image? </strong>
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<html>P-type</html>
<html>N-type</html>
<html>An intrinsic semiconductor</html>
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<img src="Germanium_semiconducto.PNG">
<br>
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<strong>7. What would happen to the current in the following semiconductor
if the orange atoms were replaced with germanium (Ge) – an element with 4
valence electrons?</strong>
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<html>Increase</html>
<html>Decrease</html>
<html>Stay the same</html>
<html>Impossible to predict without further information</html>
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<img src="p_type_hole.PNG">
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<strong>8. In which direction would the holes in this semiconductor travel?</strong>
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<html>Up</html>
<html>Right</html>
<html>Down</html>
<html>Left</html>
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<strong>9. Explain how the depletion region in a P-N junction controls the
flow of electrons. </strong>
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<strong>10. Flowing electrons in a semiconductor are traveling through
which bands? </strong>
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<html>The lowest energy valence bands available</html>
<html>The highest energy valence bands available</html>
<html>The lowest energy conduction bands available</html>
<html>The highest energy conduction bands available</html>
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<strong>11. Which of the following best explains the increase in current
that accompanies temperature increases in an intrinsic semiconductor? </strong>
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<html>Electrons acquire sufficient energy to move into the higher valence bands</html>
<html>Electrons acquire sufficient energy to move into the conduction bands</html>
<html>Electrons acquire sufficient energy to overcome the depletion region</html>
<html>At a critical temperature the Pauli Exclusion Principle no longer applies and electrons are free to travel outside of covalent bonds</html>
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<strong>12. Which of the following best explains why N-type dopants
increase conductivity? </strong>
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<html>N-type dopants decrease the size of the gap between the valence and conduction bands</html>
<html>N-type dopants don’t have to follow the Pauli Exclusion Principle</html>
<html>The electrons from N-type dopants are already at a higher energy level and can thus make the jump into the conduction band more easily</html>
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