6. 10% of a radioactive substance decays in the first 5 minutes. If Question # the initial mass is 400 grams, give a formula in terms of "t" for the amount left after "t" minutes?

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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9.
Question #
the initial mass is 400 grams, give a formula in terms of "t" for the amount left
10% of a radioactive substance decays in the first 5 minutes. If
after "t" minutes?
In(0.10)
5
A) A(t)= 400e
In(0.90)
B) A(t)=400e
%3D
In(0.90)
5
C) A(t)=360e
In(0.10)
5
D) A(t)=360e
5 In
E) A(t)=400e
Transcribed Image Text:9. Question # the initial mass is 400 grams, give a formula in terms of "t" for the amount left 10% of a radioactive substance decays in the first 5 minutes. If after "t" minutes? In(0.10) 5 A) A(t)= 400e In(0.90) B) A(t)=400e %3D In(0.90) 5 C) A(t)=360e In(0.10) 5 D) A(t)=360e 5 In E) A(t)=400e
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We have to use 1st order decay here.

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