What is the approximate age of Earth?
A. 1,000,000 years
B. 13.7 billion years
C. 6,000 years
D. 4.5 billion years
E. 4.5 million years
Answer: D
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Free protons and neutrons are spewed throughout the atmosphere by
A) nitrogen decay. B) carbon decay. C) the bombardment of cosmic rays upon atoms. D) all of the above E) none of the above
Permanent strain is _____________strain.
Fill in the blank(s) with the appropriate word(s).
Per unit area (such as a square centimeter), a B star whose surface temperature is 10,000 K will put out how much radiation compared to an O star whose surface temperature is 30,000 K?
A) 81 times as much B) 9 times as much C) 1/81 as much D) 1/9 as much E) 1/3 as much
A light ray is incident on the surface of water (n = 1.33) at an angle of 60° relative to the normal to the surface. The angle of the reflected wave is
a. 80° b. 40° c. 20° d. 60° e. 30°