BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 43, Problem 1CT
Summary Introduction

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In what direction, the prevailing winds carry the isotopes when a tsunami damaged a nuclear power plant in Fukushima, Japan on March 2011.

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Suppose a scientist finds a rock with an interesting fossil. Curious to know the age of the fossil, she takes the rock to a lab. The lab determines the amount of rubidium (Rb) and strontium (Sr) in the rock. The scientist is familiar with radiometric dating and knows that she can now calculate the age of the rock, 1, using an isochron. The Rb-Sr isochron equation is 87. Rb. [edr – 1] 86 °Sr. 87 87 Sro 86 Sro 86 Sr. 87. Rb 3.807 and 89.60. In a published table, she finds that Using the lab's values, she calculates the isotope ratios as 86 Sr. 87 = 0.7129. She also finds that the decay constant, 86 the ratio of strontium-87 to strontium-86 at the formation of the rock was Sro 2, for rubidium-87 is 1.42 x 10-11. Use the equation and provided data to calculate t. Put your answer in scientific notation and round to the nearest tenth. years x10 What is the approximate age of the rock in billions of years? Round to the nearest tenth. billions of years t =
Why is the biological half-life of a radioisotope shorter thanits physical half-life?
A rock sample which originally contained 400 grams of radioactive isotope X now contains 25 grams of the material. The half-life of isotope X is 10,000 years. How old is the rock sample? (Give your answer without any punctuation or lables. For example: 15000).
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