The half-life of I-131 is 8.00 days. If a medical treatment involves a dose of 400. mg of I-131, how much of the isotope remains after 32.0 days?
A) 200. mg
B) 100. mg
C) 50.0 mg
D) 25.0 mg
D
Environmental & Atmospheric Sciences
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Who developed the principle of uniformitarianism?
a. James Hutton b. William Smith c. Charles Darwin d. Abraham Werner e. Alfred Wegener
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The legislation that empowers the U.S. Federal government to set emissions standards that each state is required to enforce is called ____
A) Greenpeace B) The Clean Air Act C) The Clean Program D) CLEAN
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When a cold front approaches, air pressure will initially ________ due to the displacement and uplift of ________ air
A) decrease; cold B) increase; cold C) decrease; warm D) increase; warm
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