Arsenic-doped silicon is
A)
a material with holes as the dominant charge carrier.
B)
an n-type semiconductor.
C)
a p-type semiconductor.
D)
all of the above.
E)
none of the above.
B
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A perfectly opaque object that absorbs all radiation and reemits the absorbed energy as thermal radiation is
A) a hot, dense cloud of gas. B) a cold, dense cloud of gas. C) an infrared radiation emitter. D) a thermal emitter. E) transparent.
Isotopic analysis of meteorites suggests the Earth and the rest of the solar system formed
A) 3.85 billion years ago B) 4.57 billion years ago C) 4.38 billion years ago D) 4.02 billion years ago
Waves on a String: Crests of an ocean wave pass a pier every 10.0 s. If the waves are moving at 5.6 m/s, what is the wavelength of the ocean waves?
A. 56 m B. 28 m C. 64 m D. 48 m
Why is Jupiter denser than Saturn?
A) The extra mass of Jupiter compresses its interior to a greater extent than that of Saturn. B) It is made of a different composition than Saturn, including a higher proportion of hydrogen compounds and rocks. C) Its core is much larger than Saturn's. D) It has a greater proportion of helium to hydrogen compared to Saturn. E) Scientists do not know why this is so.