The isotope Cesium-137, which has a half-life of 30 years, is a product of nuclear power plants. How long will it take for this isotope to decay to about one-sixteenth its original amount?
A. 120 years
B. 960 years
C. 480 years
D. 240 years
Answer: A
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A. Protons contribute more to both the mass and size of an atom. B. Protons contribute more to an atom's mass, while electrons contribute more to its size. C. Electrons contribute more to an atom's mass, while protons contribute more to its size. D. Electrons contribute more to both the mass and size of an atom.
The H-R Diagram, an important tool of astronomers, relates stellar temperature to stellar
A. color. B. mass. C. distance. D. brightness. E. density.
A combination of related parts that interact in an organized manner is a(n) ____________________. Fill in the blank(s) with the appropriate word(s)
How do deserts form in coastal tropical regions?
A. cold ocean currents B. rain shadow C. ascending air D. drought E. continental interiors