Time taken by 131 I to decrease to 1 / 100 of the original amount if some one consumes a sample of Na 131 I is to be stated. Concept introduction: A process through which a unstable nuclide looses its energy due to excess of protons or neutrons is known as radioactive decay. The cause of instability of a nuclide is its inefficiency in holding the nucleus together. The curie is commonly used to measure nuclear radioactivity. Iodine- 131 is used in the diagnosis and treatment of thyroid disease and has a half-life of 8 days. To determine: The time taken by 131 I to decrease to 1 / 100 of the original amount.

Question

An expression for the root mean square velocity, vrms, of a gas was derived. Using Maxwell’s velocity distribution, one can also calculate the mean velocity and the most probable velocity (mp) of a collection of molecules. The equations used for these two quantities are vmean=(8RT/πM)1/2 and vmp=(2RT/M)1/2 These values have a fixed relationship to each other.(a) Arrange these three quantities in order of increasing magnitude.(b) Show that the relative magnitudes are independent of the molar mass of the gas.(c) Use the smallest velocity as a reference for establishing the order of magnitude and determine the relationship between the larger and smaller values.

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Chapter 19, Problem 38E

Interpretation Introduction

Interpretation: Time taken by 131I to decrease to 1/100 of the original amount if some one consumes a sample of Na131I is to be stated.

Concept introduction: A process through which a unstable nuclide looses its energy due to excess of protons or neutrons is known as radioactive decay. The cause of instability of a nuclide is its inefficiency in holding the nucleus together. The curie is commonly used to measure nuclear radioactivity.

Iodine-131 is used in the diagnosis and treatment of thyroid disease and has a half-life of 8 days.

To determine: The time taken by 131I to decrease to 1/100 of the original amount.

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