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Home Q & A Board Science-Related Homework Help Physics
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einsteindude einsteindude
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9 years ago
At Chernobyl, one of the harmful radioactive isotopes was 131I, a beta emitter with a halflife of 8 days. Suppose some of this isotope is deposited on a field. What can we say about this field 40 days later?
A) Its radioactivity level has decreased to 1/64--one sixty-forth--of its original level.
B) Its radioactivity has decreased to harmless levels.
C) Its radioactivity level has decreased to 1/16 of its original level.
D) It is just as radioactive as it was to begin with.
E) Its radioactivity level has decreased to 1/32 of its original level.
Textbook 
Conceptual Physical Science

Conceptual Physical Science


Edition: 6th
Authors:
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mel!811mel!811
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