Atomic Structure and Impurities Quiz
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Questions and Answers

What is the maximum number of electrons in the first shell of an atom?

  • 4
  • 2n^2 where n is the number of the shell
  • 2 (correct)
  • 8

What is an example of acceptor impurities in semiconductors?

  • Trivalent impurities
  • Pentavalent impurities (correct)
  • Tetravalent impurities
  • Hexavalent impurities

Which component is also known as the electron collector in a vacuum tube?

  • Grid
  • Anode (correct)
  • Suppressor grid
  • Cathode

At absolute zero temperature, how does a semiconductor behave?

<p>An insulator (C)</p> Signup and view all the answers

What happens to the internal resistance of a silicon diode as the forward current increases?

<p>Decreases (B)</p> Signup and view all the answers

What is the process of adding impurities to a semiconductor material called?

<p>Doping (C)</p> Signup and view all the answers

What happens to the conductivity of a semiconductor when the temperature increases?

<p>Increases (D)</p> Signup and view all the answers

In which condition does a diode conduct current?

<p>Forward-biased (A)</p> Signup and view all the answers

What is the purpose of adding a pentavalent impurity to silicon?

<p>Increase the number of free electrons (A)</p> Signup and view all the answers

Which of the following is not a type of vacuum tube?

<p>Transistor (D)</p> Signup and view all the answers

What type of chemical bond is significant in metals?

<p>Metallic bonding (A)</p> Signup and view all the answers

In a semiconductor crystal, what holds the atoms together?

<p>Covalent bonds (B)</p> Signup and view all the answers

What is recombination in the context of semiconductors?

<p>A valence electron becomes a conduction electron (D)</p> Signup and view all the answers

In the complete diode model, what is taken into account?

<p>All of these (C)</p> Signup and view all the answers

What is the function of a suppressor grid in a vacuum tube?

<p>Control the flow of electrons (C)</p> Signup and view all the answers

What determines the barrier potential of a pn junction?

<p>All of these (D)</p> Signup and view all the answers

What are elements classified as if they have four valence electrons?

<p>Compound semiconductor (A)</p> Signup and view all the answers

How is a positive ion formed?

<p>An atom gains an extra valence electron (B)</p> Signup and view all the answers

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