Sodium 24 has a half-life of approximately 15 hours. Consider a sample of 100 milligrams.

Write an equation to determine the number of milligrams remaining after t days. Show all work.
How many milligrams are remaining after 45 hours? Show all work.
How long will it be until there are 5 milligrams remaining? Show all work.

Answers

Answer 1

The decay equation is: N(t) = [tex]N0 * (1/2)^(t/T),[/tex] where N0 is the initial amount, T is the half-life, and t is time.

How to find the milligrams are remaining after 45 hours

For 45 hours, t = 45/24 = 1.875 days.

Plug values into the equation:

N(1.875) = [tex]100 * (1/2)^(1.875/0.625)[/tex]

= [tex]100 * (1/2)^3[/tex] = 12.5 milligrams.

To find when there are 5 milligrams left,

5 = [tex]100 * (1/2)^(t/0.625).[/tex]

Solving for t: t = 0.625 * log2(100/5)

= 0.625 * 4.322 = 2.70 days.

Related Questions

If your research gives you a statistic that 70% of Americans are health conscious, then compare that to the amount of money spent each year on fast
food in America, you will probably find a conflict in those numbers. This would be evidence that your study lacked_validity.

Answers

If a research study indicates that 70% of Americans are health conscious, but when compared to the amount of money spent on fast food in America, a conflict arises, it would suggest a lack of validity in the study.

Validity refers to the extent to which a study accurately measures or reflects the concept it claims to be studying.

In this case, the conflict arises because the high percentage of health-conscious individuals does not align with the substantial amount of money spent on fast food.

If the study had strong validity, we would expect to see a correlation between health consciousness and a corresponding decrease in fast food consumption or expenditure. However, the evidence suggests otherwise.

The lack of validity may be due to various reasons such as flawed data collection methods, biased sampling techniques, or inaccurate survey questions.

It is essential to critically evaluate the study's methodology and data to identify any potential sources of error or bias that could have contributed to the conflict between the reported health consciousness percentage and the expenditure on fast food.

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provide one specific example of when you might incorporate a source in your writing for work or school. Then in 2-3 sentences explain the value of incorporating sources into your writing

Answers

One specific example of when you might incorporate a source in your writing for work or school is when you are writing a research paper. In a research paper, you are expected to use sources to support your claims and arguments. By incorporating sources, you can show your readers that you have done your research and that your claims are based on evidence. This can help to make your writing more credible and persuasive.

Here is an example of how you might incorporate a source in your writing:

According to a study by the Pew Research Center, "the number of Americans who say they are willing to pay more for products that are made in the United States has increased in recent years." (Pew Research Center, 2017)

This quote from the Pew Research Center study provides evidence to support the claim that there is a growing demand for American-made products. By incorporating this source, you can show your readers that your claim is based on research and that it is not just your own opinion.

In addition to making your writing more credible, incorporating sources can also help you to learn more about your topic. When you read other sources, you are exposed to new ideas and perspectives. This can help you to develop a deeper understanding of your topic and to write a more comprehensive paper.

Overall, incorporating sources is an important part of writing for work or school. By incorporating sources, you can make your writing more credible, persuasive, and informative.

Incorporating sources into your writing adds value by enhancing the quality and reliability of your work.

One specific example of when you might incorporate a source in your writing for work or school is when you are writing a research paper on a specific topic. In this case, you would include sources such as academic journals, books, or reputable websites to support your arguments, provide evidence, and give credibility to your work.

Incorporating sources into your writing adds value by enhancing the quality and reliability of your work. It demonstrates that you have conducted thorough research, considered different perspectives, and built your arguments on a foundation of existing knowledge. By citing credible sources, you also acknowledge the contributions of others and give readers the opportunity to explore the topic further.

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What does a record tell you about a source?

Answers

A record can tell you a lot about a source. It can tell you who created the source, when it was created, what type of source it is, and where it came from. Depending on the type of record, it may also contain information about the content of the source, such as its main arguments or themes. By examining a record, you can get a sense of the context in which the source was created, which can help you evaluate its reliability and usefulness for your research.

Technician A says that one function of a damage report is to help prevent misunderstandings between the repairer and customer.

Technician B says that one function of a damage report is to document authorization to repair the vehicle.
Who is right?

Answers

Answer: both a and b

Explanation:

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