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Plasmas: Assessment
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<font color="#FFFFFF" size="5"><strong>Plasmas:</strong> Assessment</font>
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<strong>1. Assuming a sample initially contains only neutral atoms, impact
ionization can result in which of the following?</strong>
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<html>Ions </html>
<html>Electrons</html>
<html>Both ions and electrons</html>
<html>Neither ions nor electrons </html>
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<strong>2. Using the analogy of a toy stuck high up in a tree:<br>a.
explain how impact ionization could be used to retrieve the toy.<br>b.
explain how this analogy is different from impact ionization involving
atoms. </strong>
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: An object, like a ball, could be thrown up into the tree to hit the toy, thus dislodging it so it can fall to the ground. The analogy is different because toys and trees are not electrostatically bonded, so that the toy doesn’t have to be hit very hard to get it to fall to the ground.
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<strong>4. Rank these images (a-e) as lowest temperature to highest
temperature. </strong>
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<strong>5. Plasmas and gases have some similarities and differences.<br>a.
Describe the differences between plasmas and gases<br>b. Describe the
similarities between plasmas and gases </strong>
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I would expect some discussion about charged versus neutral particles, possibly high energy versus lower energy, the only interactions between particles in both gases and plasmas are collisions, freely moving particles, etc
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<strong>6. Which of the following is most consistent with the plasma state?</strong>
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<html>Many fast moving neutral particles surrounded by electrons </html>
<html>Many fast moving ions surrounded by electrons</html>
<html>Many slow moving neutral particles surrounded by electrons</html>
<html>Many slow moving ions surrounded by electrons</html>
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<strong>7. The plasma in this image showing electrons as the small
particles is under the influence of an electrical field. Which of the
following is true? Check all that apply.</strong>
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<html>The small particles will tend to move from left to right </html>
<html>The small particles will tend to move from right to left</html>
<html>The large particles will tend to move from left to right</html>
<html>The large particles will tend to move from right to left </html>
<html>The small particles will tend to move randomly </html>
<html>The large particles will tend to move randomly</html>
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<img src="Allcurrent.png">
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<strong>8. In which of these images is the electrical current greatest
between the left and right plates?</strong>
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<html>Image A</html>
<html>Image B</html>
<html>Image C</html>
<html>Image D </html>
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<strong>9. Explain why an electron avalanche will not occur in the absence
of an electric field (or some other potential field)? </strong>
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An external electric field is needed to accelerate the newly freed electrons so that they can move on to create more free electrons. If there is no electric field to feed them energy in a concentrated direction, the free electrons will eventually be scattered and lose energy.
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<strong>10. Which of the following is true of magnets used to contain
plasma? </strong>
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<html>A single magnetic field can contain both electrons and positive ions.</html>
<html>Two separate fields are required to contain both electrons and positive ions.</html>
<html>A single, sufficiently strong field can contain positive ions, but not electrons.</html>
<html>A weak magnetic field will allow electrons to escape while positive ions are contained.</html>
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