Subsurface soil that remains permanently frozen is called
a. a swamp.
b. a bogg.
c. permafrost.
d. none of these.
c
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Index of Refraction: The speed of light in a certain material is measured to be 2.2 × 108 m/s. What is the index of refraction of this material? (c = 3.0 × 108 m/s)
A. 1.1 B. 1.2 C. 1.4 D. 1.6 E. 1.8
How does the fraction of oxygen in Earth's atmosphere today compare to what it was 3 billion years ago?
a. It has significantly declined. b. It has significantly increased. c. It kept increasing up to 2 billion years ago but has been declining ever since. d. It hasn't changed.
During the course of a demonstration the professor is called away. When he returns he finds a beaker of water that was at room temperature is now at a slightly higher temperature. There is a stirring rod on the desk and a cigarette lighter. The professor can assume that the temperature increase is due to
A. heat added to the system. B. either heat added or mechanical work done. C. mechanical work done on the system.
A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses?
A) -0.28 diopters B) +0.28 diopters C) -3.6 diopters D) +3.6 diopters E) +1.8 diopters