Semiconductors: An n-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: A
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Recent discoveries of two types of brown dwarfs have placed these stars near which spectral type of star?
a. hotter than O stars b. cooler than O stars c. hotter than M stars d. cooler than M stars e. at exactly the same level as G stars
The sum of the baryonic and non-baryonic matter is 27.9% and thus equal to the critical density
a. True b. False Indicate whether the statement is true or false
What of the following most directly determines how much fuel a star has?
A. its density B. its temperature C. its speed of rotation D. its luminosity E. its mass
The most harmful radiations are those that
A) kill living cells. B) damage living cells. C) don't encounter cells.