All of the following occur during metamorphism except
A) melting.
B) recrystallization.
C) interaction with chemical fluids.
D) changes in composition.
Answer: A
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Radioactive Decay: The decay constant of a radioactive nuclide is 4.6 × 10-3 s-1. What is the half-life of this isotope, in minutes?
A. 2.5 min B. 3.6 min C. 3.1 min D. 1.4 min E. 2.0 min
An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole. b. The nail becomes a north pole or a south pole. c. The magnet exerts an attractive force on the nail. d. The nail exerts an attractive force on the magnet. e. The nail is ferromagnetic.
The pupil of the human eye is approximately 0.8 cm in diameter when adapted to the dark. The ratio of the light-gathering power of a 1.6-m telescope to that of the human eye is ____
a. 2 b. 4 c. 20 d. 400 e. 40,000
What eventually halts the gravitational collapse of an interstellar gas cloud that forms a brown dwarf rather than a true (main-sequence) star?
A) The central object becoming hot enough to sustain nuclear fusion in its core B) Degeneracy pressure caused by the high density of electrons in the core C) Thermal pressure from the high core temperature D) The onset of convection in the object's outer layers