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A radioactive substance has a half-life of one week. In other words, at the end of every week the level of radioactivity is half of its value at the beginning of the week. The initial level of radioactivity is 20 counts per second. a) Find the formula that gives the radioactivity in terms of time (t). b) Find the radioactivity left after three weeks.

A radioactive substance has a half-life of one week. In other words, at the end of every week the level of radioactivity is half of its value at the beginning of the week. The initial level of radioactivity is 20 counts per second. a) Find the formula that gives the radioactivity in terms of time (t). b) Find the radioactivity left after three weeks.

Algebra and Trigonometry (6th Edition)
Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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A radioactive substance has a half-life of one week. In other words, at the end of every week the level of radioactivity is half of its value at the beginning of the week. The initial level of radioactivity is 20 counts per second. a) Find the formula that gives the radioactivity in terms of time (t). b) Find the radioactivity left after three weeks. Formula: y = a(bji or y = a(1 + r)i Where, y is the population after x time; a is the initial amount bis the growth factor which is equal to 1+r r is the rate growth as decimal x is the units of time T is the time when the quantity doubled (growth factor)
Transcribed Image Text:A radioactive substance has a half-life of one week. In other words, at the end of every week the level of radioactivity is half of its value at the beginning of the week. The initial level of radioactivity is 20 counts per second. a) Find the formula that gives the radioactivity in terms of time (t). b) Find the radioactivity left after three weeks. Formula: y = a(bji or y = a(1 + r)i Where, y is the population after x time; a is the initial amount bis the growth factor which is equal to 1+r r is the rate growth as decimal x is the units of time T is the time when the quantity doubled (growth factor)
y = a(b)f or y = a(1 + r)i
Transcribed Image Text:y = a(b)f or y = a(1 + r)i
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