Semiconductors: A p-type semiconductor is produced by
A. doping the host crystal with donor impurities.
B. doping the host crystal with acceptor impurities.
C. pure crystals of germanium.
Answer: B
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Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). You measure the amount and determine that there are 5 grams of potassium-40 in the rock
By measuring the amount of its decay product (argon-40 ) present in the rock, you realize that there must have been 40 grams of potassium-40 when the rock solidified. How old is the rock? A) 1.3 billion years B) 2.6 billion years C) 3.9 billion years D) 5.2 billion years E) none of the above
Satellite Motion: A satellite of mass 500 kg orbits the earth with a period of 6000 s. The earth has a mass of 5.97 × 1024 kg, a radius of 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2.(a) Calculate the magnitude of the earth's gravitational force on the satellite.(b) Determine the altitude of the satellite above the earth's surface.
What will be an ideal response?
The back of a person's eye is too close to the lens. This person is suffering from
A) nearsightedness. B) spherical aberration. C) astigmatism. D) chromatic aberration. E) farsightedness.
According to Mathiessen’s rule, the electrical resistivity of a metal is the _________of electrical resistivity of 0, 1, 2, and 3-dimensional defects and thermal vibrations.
Fill in the blank(s) with the appropriate word(s).