Radioactive decay can be described by the following equation In A = In Ao – kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope iodine-131, k is 8.62 × 10-2 days. If the original amount of iodine-131 in a sample is 60.9 mg, how much time is needed for the amount of iodine-131 that remains to fall to 33.7 mg? days

Radioactive decay can be described by the following equation In A = In Ao – kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope iodine-131, k is 8.62 × 10-2 days. If the original amount of iodine-131 in a sample is 60.9 mg, how much time is needed for the amount of iodine-131 that remains to fall to 33.7 mg? days

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Temperature effects on atom arrangements

Atoms are the smallest units of matter. Atoms can be subdivided into electrons, protons, and several other subatomic particles. Groups or combinations of atoms form molecules that primarily decide the property and behavior of materials. These molecules have the property to attract other molecules based on the valence electrons in the atoms' outermost orbit. An orderly arrangement of molecules is known as crystal structure, which forms the fundamental topic of concern in materials science and engineering. The arrangement of molecules is different for different materials and hence, each material exhibits different lattice arrangements. The lattice arrangements are functions of external loads, deformations, and temperature. On experiencing high temperatures or low temperatures, the behavior of the lattice arrangement of a material change.

Question

Radioactive decay can be described by the following equation
In A = In Ao – kt
where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a
constant that is characteristic of the substance.
-1
For the radioactive isotope iodine-131, k is 8.62 × 10-2 days
If the original amount of iodine-131 in a sample is 60.9 mg, how much time is needed for the amount of iodine-131 that
remains to fall to 33.7 mg?
days

The pH scale was designed to make it convenient to express hydrogen ion concentrations that are small in aqueous
solutions. The definiton of pH is in terms of base 10 logarithms.
pH
– log[H*]
where H+ is the hydrogen ion concentration.
a. If the hydrogen ion concentration in a solution is 2.51 × 10-4 mol/L, the pH is
b. If the pH of a solution is 3.433, the hydrogen ion concentration is
mol/L.

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