The difference between donor and acceptor atoms in a doped semiconductor is that
a. the donor energy level lies halfway between the valence band and the acceptor level.
b. the donor energy level lies near the valence band and the acceptor energy level lies near the conduction band.
c. donor energy levels cannot exist unless acceptor energy levels are present.
d. the donor energy level lies near the conduction band and the acceptor energy level lies near the valence band.
e. the acceptor energy level lies halfway between the conduction band and the donor energy level.
d
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Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A) We know the star's luminosity and distance. B) The star is of spectral type G. C) The star is a member of a binary star system. D) The star is of spectral type A.
An object is located on the optical axis and a distance of 8 cm from a thin converging lens having focal length 10 cm. the image of the object is
1.real, upright, and smaller than the object. 2.real, inverted, and smaller than the object. 3.real, inverted, and larger than the object. 4.virtual, upright, and smaller than the object. 5.virtual, inverted, and larger than the object. 6.virtual, upright, and larger than the object. 7.None of the above.
Spectra of the Martian surface taken from orbiting spacecraft have detected the presence of which of the following minerals that form in water?
A) hydrated clays, sulfates and silicates B) limestones C) zircons D) sea and rock salts
As the planets orbit the Sun, they are never far from the ________ on the celestial sphere.
A. horizon B. meridian C. celestial equator D. celestial pole E. ecliptic