The concentration of Rn-222 in the basement of a house is 1 .8×10 -6 mol/L. When the air remains static, the concentration of the radon after 2.4 days should be determined. Concept Introduction : Half-life ( t 1 2 ) is the time required for a quantity to reduce to half its initial value.. An unstable nucleus emits radiation spontaneously to become stable nuclei by losing energy. This process of emission of radiation by unstable nuclei is known as radioactive decay. In general the substance left after n half –lives is ( 1 2 ) n . n = Given days to needed to reduce the concentration of the substance Half-life of the given substance To determine: The n days required to reduce the concentration of the given Rn-222.

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Chapter 21.8, Problem 3PPA

Interpretation Introduction

Interpretation: The concentration of Rn-222 in the basement of a house is 1.8×10-6 mol/L. When the air remains static, the concentration of the radon after 2.4 days should be determined.

Concept Introduction:

Half-life ( t12 ) is the time required for a quantity to reduce to half its initial value..

An unstable nucleus emits radiation spontaneously to become stable nuclei by losing energy. This process of emission of radiation by unstable nuclei is known as radioactive decay.

In general the substance left after n half –lives is (12)n .

n = Given days to needed to reduce the concentration of the substanceHalf-life of the given substance

To determine: The n days required to reduce the concentration of the given Rn-222.

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