Chapter 3: Problem 1
Express each equation in logarithmic form. $$2^{6}=64$$
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Chapter 3: Problem 1
Express each equation in logarithmic form. $$2^{6}=64$$
These are the key concepts you need to understand to accurately answer the question.
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Strontium \(90(\mathrm{Sr}-90)\), a radioactive isotope of strontium, is present in the fallout resulting from nuclear explosions. It is especially hazardous to animal life, including humans, because, upon ingestion of contaminated food, it is absorbed into the bone structure. Its half-life is \(27 \mathrm{yr}\). If the amount of \(\mathrm{Sr}-90\) in a certain area is found to be four times the "safe" level, find how much time must elapse before an "acceptable level" is reached.
Use the laws of logarithms to expand and simplify the expression. $$\ln x(x+1)(x+2)$$
Phosphorus 32 (P-32) has a half-life of \(14.2\) days. If \(100 \mathrm{~g}\) of this substance are present initially, find the amount present after \(t\) days. What amount will be left after \(7.1\) days?
A radioactive substance decays according to the formula $$ Q(t)=Q_{0} e^{-k t} $$ where \(Q(t)\) denotes the amount of the substance present at time \(t\) (measured in years), \(Q_{0}\) denotes the amount of the substance present initially, and \(k\) (a positive constant) is the decay constant. a. Show that half-life of the substance is \(\bar{t}=\ln 2 / k\). b. Suppose a radioactive substance decays according to the formula $$ Q(t)=20 e^{-0.000123 \mathrm{x} i} $$ How long will it take for the substance to decay to half the original amount?
Employers are increasingly turning to GPS (global positioning system) technology to keep track of their fleet vehicles. The estimated number of automatic vehicle trackers installed on fleet vehicles in the United States is approximated by $$ N(t)=0.6 e^{0.17 t} \quad(0 \leq t \leq 5) $$ where \(N(t)\) is measured in millions and \(t\) is measured in years, with \(t=0\) corresponding to 2000 . a. What was the number of automatic vehicle trackers installed in the year \(2000 ?\) How many were projected to be installed in \(2005 ?\) b. Sketch the graph of \(N\).
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