A home fireplace loses most of its heat by
a. radiation into the room.
b. convection up the chimney.
c. radiation up the chimney.
d. conduction to the sides of the fireplace.
b
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Radioactivity Basics: In the radioactive decay equation 
Po? ? 
Po + X, what is X?
Fill in the blank(s) with the appropriate word(s).
Carbon-14 Dating: An archaeologist finds the 14C in a sample of 2.10 g of material to be decaying at 107 Bq. A modern 1.00-g sample of the same material decays at 151 Bq,and assume this rate has also held in the past. The half-life of 14C is 5730 years. How old is the sample?
A. 8980 years B. 6230 years C. 17,000 years D. 8530 years
To maximize the magnification of a refracting telescope, what lenses should you choose?
A) The objective lens should have a small focal length and the eyepiece should have a large focal length. B) The objective lens and eyepiece should both have large focal lengths. C) The objective lens and eyepiece should both have small focal lengths. D) The objective lens should have a large focal length, but it doesn't matter what the focal length of the eyepiece is. E) The objective lens should have a large focal length and the eyepiece should have a small focal length.
Blocks of ice buried in a glacial moraine often result in the formation of
A) drumlins. B) roches moutonnees. C) small glacial lakes—kettle lakes. D) eskers.