Adding a few impurity atoms, like arsenic or gallium, to a semiconductor can produce

A. abundant thermal inversion.
B. a significant increase in mass, even though the impurity atoms are quite sparse.
C. gravitational repulsion of the impurity atoms, like the expanding universe.
D. useful changes in the conductivity.


Answer: D

Physics & Space Science

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If you move an electron from a lower energy level to a higher energy level, you can call the atom a(n) _____

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Series/Parallel Circuits: Three resistors of 12 ?, 12 ?, and 6.0 ? are connected together, and an ideal 12-V battery is connected across the combination. What is the current from the battery if they are connected (a) in series or (b) in parallel?

Fill in the blank(s) with the appropriate word(s).

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Captain Rickard orders his starship to accelerate from rest at a rate of "1g" (accel = 9.8 m/s2). How long does it take the starship to reach one-tenth the speed of light if light travels 300. megameters/s?

What will be an ideal response?

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An object on the flat bed of a truck that is accelerating along a straight horizontal road. The coefficient of static friction is 0.300 in this case. Of the following choices, which is the lowest value of acceleration that would result in the object sliding on the bed of the truck?

A. 0.280 m/s2 B. 0.310 m/s2 C. 2.93 m/s2 D. 2.99 m/s2 E. 3.02 m/s2

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