Biology: The half-life of rubidium-87 is 48.8 billion years. What is the length of 6 half-lives?

The half-life of rubidium-87 is 48.8 billion, №13304552, 27.04.2020 03:26

Biology

The following table shows the currently accepted half-life values for four parent isotopes. Parent Isotope Currently Accepted Half-Life Values Uranium-238 4.5 billion years Uranium-235 704 million years Thorium-232 14.0 billion years Rubidium-87 48.8 billion years Potassium-40 1.25 billion years Samarium-147 106 billion years Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope? Rubidium-87 Thorium-232 Uranium-235

Step-by-step answer

P Answered by Specialist

ok the answers are simple:

Parent Isotope Currently Accepted Half-Life Values: is the first one uranium-238 4.5 billion years

Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope: uranium- 238

Chemistry

The following table shows the currently accepted half-life values for six parent isotopes. parent isotope currently accepted half-life values uranium-238 4.5 billion years uranium-235 704 million years thorium-232 14.0 billion years rubidium-87 48.8 billion years potassium-40 1.25 billion years samarium-147 106 billion years earth is approximately 4.5 billion years old. given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope? potassium-40 rubidium-87 samarium-147

Step-by-step answer

P Answered by PhD

3

The amount of substance present in a certain sample can be calculated through the equation,

A(t) = A(o)(0.5)^(t/h)

where At is the amount now, Ao is the original amount, t is the number of years and h is the half-life.

For a substance to at most 50% of the original amount, we get the half-life value.

At/Ao = 0.5 = 0.5^(4.5/h)

h = 4.5 billion.

All values below 4.5 billion as half-life are accepted. From the given list, the substances that would be less than 50% now are:

Uranium - 238 ; Uranium -235 and ; Postassium-40

Chemistry

The following table shows the currently accepted half-life values for six parent isotopes. parent isotope currently accepted half-life values uranium-238 4.5 billion years uranium-235 704 million years thorium-232 14.0 billion years rubidium-87 48.8 billion years potassium-40 1.25 billion years samarium-147 106 billion years earth is approximately 4.5 billion years old. given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope? potassium-40 rubidium-87 samarium-147

Step-by-step answer

P Answered by PhD

8

The answer to your question is Potassium-40

Explanation:

We know that the earth is approximately 4.5 billion years old, so to answer this question we must look for an isotope whose half-life is lower than 4.5 billion years.

Potassium-40 has a half-life of 1.25 billion years, this the isotope we are looking for.

Rubidium-87 has a half-life many times higher than 4.5 billion years, so this is not the answer.

Samarium-147 also has a half-life many times higher than 4.5 billion years, so this is not the correct answer.

Uranium-238 has a half-life equal to the age of the earth, so this is not the correct answer.

Chemistry

The following table shows the currently accepted half-life values for six parent isotopes. parent isotope currently accepted half-life values uranium-238 4.5 billion years uranium-235 704 million years thorium-232 14.0 billion years rubidium-87 48.8 billion years potassium-40 1.25 billion years samarium-147 106 billion years earth is approximately 4.5 billion years old. given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope? potassium-40 rubidium-87 samarium-147

Step-by-step answer

P Answered by PhD

3

The amount of substance present in a certain sample can be calculated through the equation,

A(t) = A(o)(0.5)^(t/h)

where At is the amount now, Ao is the original amount, t is the number of years and h is the half-life.

For a substance to at most 50% of the original amount, we get the half-life value.

At/Ao = 0.5 = 0.5^(4.5/h)

h = 4.5 billion.

All values below 4.5 billion as half-life are accepted. From the given list, the substances that would be less than 50% now are:

Uranium - 238 ; Uranium -235 and ; Postassium-40

Biology

The following table shows the currently accepted half-life values for four parent isotopes. Parent Isotope Currently Accepted Half-Life Values Uranium-238 4.5 billion years Uranium-235 704 million years Thorium-232 14.0 billion years Rubidium-87 48.8 billion years Potassium-40 1.25 billion years Samarium-147 106 billion years Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope? Rubidium-87 Thorium-232 Uranium-235

Step-by-step answer

P Answered by Master

ok the answers are simple:

Parent Isotope Currently Accepted Half-Life Values: is the first one uranium-238 4.5 billion years

Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope: uranium- 238

Biology

One parrot species that feeds on large seeds nests is in the same tree as a parakeet that feeds on small seeds. How are the birds able to coexist?

Step-by-step answer

P Answered by PhD

One parrot species that feeds on large seeds nests is in the same tree as a parakeet that feeds on small seeds, they occupy different niches.

Biology

Give examples of myths about aging that many people believe. Why are these myths harmful?

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P Answered by PhD

Myths about aging :

Depression and loneliness are normal in older adults. ...

The older I get, the less sleep I need. ...

Older adults can't learn new things. ...

It is inevitable that older people will get dementia. ...

Older adults should take it easy and avoid exercise so they don't get injured.

Myths about aging : Depression and loneliness are normal in older adults. ...The older I get, t

Biology

Suppose there are five genes in pumpkins that work additively to affect pumpkin size. A homozygous lowercase allele pumpkin, aabbccddee, weighs 20 lb. Each capitalized allele additively affects the final phenotype by either adding or subtracting weight from the base pumpkin size. The effect of a single capitalized allele is listed in the table. AlleleEffect A +6 B −2 C −3 D +3 E +4 What would the potential size range be for pumpkin offspring produced from the cross between a parent with genotype aaBbCCDdEe and a parent with genotype AaBBCcddEe?

Step-by-step answer

P Answered by PhD

Answer : 900 kg pumpkins

Biology

Angelica suffers from a neurological disease or disorder. She insists on wearing sunscreen every time she is exposed to the sun because it helps reduce the symptoms of her condition. Which neurological disease or disorder does Angelica most likely have?

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P Answered by PhD

Angelica suffers from lupus disease.people with this disease are extremely sensitive to sun light.

Biology

What are the roles of fungi? Check all that apply. Fungi can be used to develop medicine. Fungi are a food source for animals and humans. Fungi produce oxygen to breathe. Fungi destroy rocks and minerals. Fungi are natural recyclers. Fungi cause infections.

Step-by-step answer

P Answered by PhD

Fungi are a food source for animals and humans. Fungi produce oxygen to breathe. Fungi destroy rocks and minerals. Fungi are natural recyclers.

The half-life of rubidium-87 is 48.8 billion years. What is the length of 6 half-lives?

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