Answered: COVID-19 particles are on a surface at… | bartleby

Algebra & Trigonometry with Analytic Geometry

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter5: Inverse, Exponential, And Logarithmic Functions

Section: Chapter Questions

Problem 9T

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COVID-19 particles are on a surface at a temperature between 70 and 75 degrees Farenheit with 80 percent humidity. According to the findings by the U.S. Department of Homeland Security, the half life of COVID-19 particles under these conditions is 360 minutes
How long will it take for 100 COVID-19 particles under these conditions to decay to 19 particles? Minutes=

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Repeat Example 5 when microphone A receives the sound 4 seconds before microphone B.
CD4 cells are carried in the blood as part of the human immune system. One of the effects of the HIV virus is that these cells die. In this study of the effectiveness of a new anti-viral drug on HIV, 20 HIV-positive patients had their CD4 counts recorded (“Baseline”) and then were put on a course of treatment with this drug. After using the drug for one year, their CD4 counts were again recorded (“OneYear”). The aim was to show that patients taking the drug had increased CD4 counts which is not generally seen in HIV-positive patients. Baseline OneYear 2.12 2.47 4.35 4.61 3.39 5.26 2.51 3.02 4.04 6.36 5.1 5.93 3.77 3.93 3.35 4.09 4.1 4.88 3.35 3.81 4.15 4.74 3.56 3.29 3.39 5.55 1.88 2.82 2.56 4.23 2.96 3.23 2.49 2.56 3.03 4.31 2.66 4.37 3.00 2.40 1) What is the correlation between baseline and one year CD4 counts?
Solve question 11 for part D only.
Suppose the half-life of a certain radioactive substance is 20 days and that there are5 grams present initially. When will there be only 1 gram of the substance remaining?
QUESTION 2 A sample of the radioactive isotope PL-50 has a half life of 1500 years. How long does it take for this sample to decay to 84% of the original sample? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt Tx XOG
A bacteria culture had a population of 13 million at 10:00 am and by 2:00 pm had grown to 21 million. Predict the population at 6:00 pm that same day.
Part c: find beta/2
An archaeological sample contains 0.622 g of lead-206 and 2.198 g of uranium-238. Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample. The decay rate constant for the uranium is 1.54 x 10-10 of the sample? year. What is the age O a.9.1 x 109 years O b.7 7.98 x 108 years OC 1.84 × 109 years O d. 7.26 x 109 years O e. none of these
Scientists can determine the age of ancient objects by the method of radiocarbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope of carbon, ¹4C, with a half-life of about 5,730 years. Vegetation absorbs carbon dioxide through the atmosphere, and animal life assimilates ¹4C through food chains. When a plant or animal dies, it stops replacing its carbon, and the amount of ¹4C present begins to decrease through radioactive decay. Therefore, the level of radioactivity must also decay exponentially. A discovery revealed a parchment fragment that had about 54% as much 14C radioactivity as does plant material on the earth today. Estimate the age (in years) of the parchment. (Round your answer to the nearest hundred years.)
An important tool in archeological research is radiocarbon dating, developed by the American chemist Willard F. Libby.3 This is a means of determining the age of certain wood and plant remains, and hence of animal or human bones or artifacts found buried at the same levels. Radiocarbon dating is based on the fact that some wood or plant remains contain residual amounts of carbon-14, a radioactive isotope of carbon. This isotope is accumulated during the lifetime of the plant and begins to decay at its death. Since the half-life of carbon-14 is long (approximately 5730 years),4 measurable amounts of carbon-14 remain after many thousands of years. If even a tiny fraction of the original amount of carbon-14 is still present, then by appropriate laboratory measurements the proportion of the original amount of carbon-14 that remains can be accurately determined. In other words, if Q(t) is the amount of carbon-14 at time t and Q0 is the original amount, then the ratio Q(t)/Q0 can be…
The half-life of carbon-14 is 5600 years. If a piece of charcoal made from the wood of a tree shows only Please help me!!
According to estimates, the global emissions of CO2 in the energy sector will total about 36 billion metric tons in 2020. The energy sector has been decarbonizing at a rate of 1% per year. estimated to be "decarbonizing" at a rate of 1% per year. Suppose that the energy sector continued to decarbonize at the historical rate of 1% per year. Estimate the amount of time it would take for global emissions of CO2 from the energy sector to drop below 8 billion metric tons per year. Round your answer to the nearest year.

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