The electrical resistivity of a semiconductor
b.
The electrical resistivity grows quite large at low temperatures
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According to our theory of solar system formation, why do all the planets orbit the Sun in the same direction and in nearly the same plane?
A) The original solar nebula happened to be disk shaped by chance. B) Any planets that once orbited in the opposite direction or a different plane were ejected from the solar system. C) The laws of conservation of energy and conservation of angular momentum ensure that any rotating, collapsing cloud will end up as a spinning disk. D) The Sun formed first, and as it grew in size it spread into a disk, rather like the way a ball of dough can be flattened into a pizza by spinning it. E) It is a coincidence, as we would expect that most other solar systems would not have all their planets orbiting in such a pattern.
In astronomy, an interferometer can be used to:
A) yield better seeing conditions with optical telescopes. B) decrease the effects of light pollution in getting darker sky backgrounds. C) improve the angular resolution of radio telescopes. D) increase the sensitivity of infrared telescopes to longer wavelengths. E) speed up the processing of CCD images.
An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
A. 2.2 m/s2 B. 2.7 m/s2 C. 3.3 m/s2 D. 3.8 m/s2 E. 4.4 m/s2
A hydrogen atom is in the 6h state. Which one of the following is not a magnetic quantum number for that state?
A) 0 B) 1 C) 2 D) 4 E) 6