A sample of a radioactive substance has an initial mass of 563.6 mg. This substance follows a continuous exponential decay model and has a haif-life of 7 days. (a) Let r be the time (in days) since the start of the experiment, and let y be the amount of the substance at time t. - Olno Write a formula relating y to r. Use exact expressions to fil in the missing parts of the formula. Do not use approximations. (b) How much will be present in 19 days? Do not round any intermediate computations, and round your answer to the nearest tenth.
A sample of a radioactive substance has an initial mass of 563.6 mg. This substance follows a continuous exponential decay model and has a haif-life of 7 days. (a) Let r be the time (in days) since the start of the experiment, and let y be the amount of the substance at time t. - Olno Write a formula relating y to r. Use exact expressions to fil in the missing parts of the formula. Do not use approximations. (b) How much will be present in 19 days? Do not round any intermediate computations, and round your answer to the nearest tenth.
Introductory Chemistry: An Active Learning Approach
6th Edition
ISBN:9781305079250
Author:Mark S. Cracolice, Ed Peters
Publisher:Mark S. Cracolice, Ed Peters
Chapter20: Nuclear Chemistry
Section: Chapter Questions
Problem 65E
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Transcribed Image Text:A sample of a radioactive substance has an initial mass of 563.6 mg. This substance follows a continuous exponential decay model and has a haif-life of 7
days.
(a) Let r be the time (in days) since the start of the experiment, and
let y be the amount of the substance at time r.
Oina
Write a formula relating y to r.
Use exact expressions to fill in the missing parts of the formula,
Do not use approximations.
(b) How much will be present in 19 days?
Do not round any intermediate computations, and round your
answer to the nearest tenth.
O mg
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