Half life of Iodine- 131 is given. Number of days taken by 174 g of 131 I to decay to 83 g of 131 I is to be calculated. Concept introduction: In radioactive decay, the decomposition of a parent nuclide takes place and a new daughter nuclide is formed. Decay constant is the quantity that expresses the rate of decrease of number of atoms of a radioactive element per second. Half life of radioactive sample is defined as the time required for the number of nuclides to reach half of the original value. To determine: The number of days taken by 174 g of 131 I to decay to 83 g of 131 I .

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Chapter 18, Problem 75CWP

Interpretation Introduction

Interpretation: Half life of Iodine- 131 is given. Number of days taken by 174 g of 131I to decay to 83 g of 131I is to be calculated.

Concept introduction: In radioactive decay, the decomposition of a parent nuclide takes place and a new daughter nuclide is formed.

Decay constant is the quantity that expresses the rate of decrease of number of atoms of a radioactive element per second.

Half life of radioactive sample is defined as the time required for the number of nuclides to reach half of the original value.

To determine: The number of days taken by 174 g of 131I to decay to 83 g of 131I .

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