Initially 100 milligrams of a radioactive substance were present. After 6 hours the mass had decreased by 3%. If the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. Select the correct response:

Initially 100 milligrams of a radioactive substance were present. After 6 hours the mass had decreased by 3%. If the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. Select the correct response:

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter4: Environmental Consequences Of Fossil Fuel Use

Section: Chapter Questions

Problem 20P

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Concept explainers

Fluid Materials

In general terms, anything that flows can be termed as a fluid. In other words, a fluid is any substance that cannot resist shear forces and deforms continuously under the application of external shear forces. Fluid materials differ completely from solid materials such as metals and alloys. For instance, if we consider two infinitesimally small cross-sectional areas of fluid materials and solid materials, and apply shear forces to these elements, both the elements will undergo deformation. Upon releasing the shear force, the element of the solid materials will regain its original orientation, but the element of the fluid materials will keep on deforming continuously under the action of the shear force.

Question

Initially 100 milligrams of a radioactive substance were present. After 6 hours the mass had decreased by 3%.
If the rate of decay is proportional to the amount of the substance present at time t, find the amount
remaining after 24 hours.
Select the correct response:
33.2 mg
none of the choices
92.6 mg
88.5 mg

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