Suppose you have a 100 mg sample of Au-191, which has a half-life of 3.4 hours. How much will remain after 10.2 hours?

A 100 mg

B 50 mg

C 25 mg

D 12.5 mg

Answers

Answer 1
10.2 hours is equivalent to three half-lives, so after 10.2 hours, the mass of the sample would have decayed by half three times over. If one starts with 100 mg of the sample, then after three half-lives, there would be 100(0.5)³ = 12.5 mg of the sample remaining.

Thus, the correct answer choice here would be D.
Answer 2
i am here to confirm that it is D 12.5 bc most of the times brainly gives me wrong answers so yeah it is D

Related Questions

Which best explains the governance of the shaded areas shown on the map. With a map of American Indian reservations.

Answers

Answer:

These areas show where indigenous people have limited amount of self governance at a national scale

Explanation:

The areas depict how native groups have minimal self-government on a national scale, thus best explaining the administration of the colored areas depicted on the map.

The federal Indian reservation is indeed an area of land designated as a permanent tribal homeland by a treaty or even another arrangement with the United States. Its executive order, specific law, or administrative action, where the national government retains the claim to the property in trust for the tribe. The primary goals for Indian reservations were to put American Indians under the supervision of the U.S. government.  It reduces violence between Indians and whites and encourages American Indians to embrace the white man's lifestyle.

Learn more about American Indian reservations:

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Not really a question but I searched most of my test questions on here and I made a 50. Is it just me or is it people putting wrong answers down

Answers

Some people just put random stuff for points.

Which of the following scenarios would best indicate a farmer using Green Revolution agricultural methods?

A) A farmer switches from a plow pulled by a horse to a plow pulled by a tractor
B) A tribe begins to rely on irrigation to water their crops, which means they no longer engage in shifting cultivation
C) Scientists working for a German corporation develop an herbicide that kills 98% of unwanted vegetation in their lettuce crops, but does not damage the lettuce.
D) Indonesian farmers harvest coffee beans and then burn the remaining vegetation, planning to return to the field in six years.
E) An American corporation opens a 600 acre farm in Costa Rica which harvests $60 million worth of sugar cane annually.

Answers

Answer: C. Scientists working for a German corporation develop an herbicide that kills 98% of unwanted vegetation in their lettuce crops, but does not damage the lettuce.

Explanation:

The Green Revolution, refers to the research and technological initiatives that brought about an increase in agricultural production. In this situation, the use of pesticides, herbicides, and high yield varieties led to an increase in the production of crop.

The best situation that indicates a farmer using Green Revolution agricultural method is a scientists working for a German corporation develop an herbicide that kills 98% of unwanted vegetation in their lettuce crops, but does not damage the lettuce.

What is the difference between a joke and a mistake if my parents use both in one sentence while talking to me?

Answers

Answer:

joke is doing something which you knew it will cause a problem and mistake is doing things without knowing the result

What is the file extension for PowerPoint and Word?

Answers

The file extension are: docx, . xlsx, and . pptx

What are the environmental impacts of climate change?

Answers

Answer:

There are so many.

Explanation:

Temperatures Rising,

More Droughts/Heat Waves,

Sea Levels Rising,

Ice Caps Melting,

More Endangered Animals

Which of the following best describes the roles of women in the rural, agricultural economies of sub- Saharan Africa? A) Salaried workers in large-scale commercial agriculture B) Nonwage workers on small, family-run farms C) Hourly workers in seasonal migratory farm work D) Landowners of export-oriented farms I E Drivers and operators of agricultural equipment​

Answers

B) Nonwage workers on small, family-run farms

Statement that explains the roles of women in the rural, agricultural economies of sub- Saharan Africa is  B) Nonwage workers on small, family-run farms.

According to this question,we are to discuss about roles of women in the rural, agricultural economies of sub- Saharan Africa.

As a result if this we can see that women in this region have small roles compare to male counterpart, they are Nonwage workers on small, family-run farms.

Learn more about sub- Saharan Africa  at:

https://brainly.com/question/21281149

Which of the following was NOT an effect of the second agricultural revolution?

A) improved life expectancy
B) improved diets
C) more people available for factory work
D) improved medicine
E) an increase in the output of farms

Answers

The answer to the question is B

Which of these is a function of the digestive system?
A.
transports nutrients to other organs
B.
eliminates nondigestible waste
C. regulates blood flow
D.
builds big molecules from smaller molecules

Answers

eliminates nondigestible waste

So B is the answer

The answer is B because the digestion system digest things meaning it breaks it down like food

1 paragraph poem about life.

Answers

You may see me struggle,

but you won't see me fall.

Regardless if I'm weak or not,

I'm going to stand tall.

Everyone says life is easy,

but truly living it is not.

Times get hard,

people struggle

and constantly get put on the spot.

I'm going to wear the biggest smile,

even though I want to cry.

I'm going to fight to live,

even though I'm destined to die.

And even though it's hard

and I may struggle through it all,

you may see me struggle...

but you will NEVER see me fall.

Why is reduced precipitation, rather than drought, the leading cause of limited water availability?

A) Reduced precipitation is the cause of drought.
B) Drought only impacts the supplies of groundwater.
C) Water availability depends upon drought conditions.
D) Drought only affects areas with vegetation.
E) Precipitation limits the amount of water in many environments.

Answers

Answer:

A

Explanation:

WILL GIVE BRAINLIEST
Which of the following best reflects how conditions described in this passage affected developing countries such as India?

A. The Indian government taking ownership of private industries to protect the country’s economy

B. People moving from India to more developed countries such as Great Britain in search of work

C. Industrial production centers closing in India, as those kinds of jobs moved back to Europe

D. India’s economy modernizing to catch up with the developed world

Answers

Answer:

B

Explanation:

Give Brainlyist plsss

The answer would be B!!

Which of the following statements explains the cost and distance relationship illustrated in the model in relation to the urban area's residential patterns?
A. Since land is more expensive in the suburbs wealthier families build larger single-family homes in zone five in areas that provide amenities such as private schools for their children
B. Land is cheaper near the central business district(CBD)resulting in the construction of low income apartments and giving low income residents access to the amenities of the CBD
C. The lower cost of land farther from the CBD makes it affordable to build single-family homes in zones 5 and 5 for a middle income and high income residents who desire to move into less crowded areas
D. People do not live in the CBD because of the traffic congestion, high cost of land, and lack of amenities such as museums and restaurants
E. Population density increases with the distance from the CBD and land prices decrease allowing residents of all income levels to move farther away from zone 2

Answers

Answer:

AP classroom said its C

Explanation:

trust me bro

You have 400 mg of a radioisotope with a half-life of 5 minutes. How much will be left after 30 minutes?

A 6.25mg

B 12.5 mg

C 100 mg

D 50 mg

Answers

If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.

Thus, A would be the correct answer choice here.

You have 400 mg of a radioisotope with a half-life of 5 minutes. The time that will be left after 30 minutes is 6.25 mg. The correct option is A.

What are radioisotopes?

The radioactive isotopes of an element are called radioisotopes. They can alternatively be described as atoms with surplus energy in their nucleus or unstable neutron-proton combinations.

A radionuclide is an unstable nuclide with too much nuclear energy. The extra energy can either be transferred to one of the nucleus' electrons to release it as a conversion electron, released from the nucleus as gamma radiation or used to build and emit a new particle from the nucleus.

Nuclear transmutations: natural radioactivity. Less than a hundred radioisotope types are recognized, yet there are more than a few thousand. Accelerators and Research Reactors for Man-Made Radioactive Isotopes.

If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.

Therefore, the correct option is A. 6.25 mg.

To learn more about radioisotopes, refer to the link:

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Describe ONE difference between the level of industrialization typically seen in more developed countries and the level seen in less developed countries.

Answers

I'll use the countries.. America and Pakistan, Americas industries is more advancely and more largely developed then Pakistan's industries

Industrialized countries have a greater capacity to produce goods and services than other countries.

Industrialization is a term that refers to the production of goods and services. Industrialization is related to the development of new technologies and machines to optimize production processes.

According to the above, more developed countries have a greater capacity to produce goods and services, such as the United States, Russia, Japan, and China, because much of its economy is based on the production of services and goods. On the other hand, less developed countries (also known as developing or underdeveloped countries) do not yet have a high capacity to produce goods and services. On the contrary, their economies are based on other fields such as agriculture or resource extraction.

Learn more in: https://brainly.com/question/7721379

A_____ is the place where an organism lives.

Answers

Answer:

Habitat.

Explanation:

A habitat, or a natural home that an organism presides in, is the place where an organism lives.

~

Answer:

H-A-B-I-T-A-T

Habitat

what are some ways to give back to the community

Answers

Answer: Donate. Sometimes giving back to the community is as simple as giving

Explanation:

You could provide meals for homeless, pick up trash, donate (as said above), shop at your local stores (you’d be giving back to the shops which all around brings money into the community, helping it)... there really are lots of ways to help, but these are just a few of em. Hope this helps.


Subsistence agriculture is always characterized by
A. double-cropping of specific grains
B. Extensive use of land
C. Production only for family consumption
D. Production only for trade
E. Irrigation and inorganic fertilization

Answers

Answer: production only for family consumption

Explanation:

Subsistence agriculture is always characterized by production only for family consumption. The correct option is C.

What is Subsistence agriculture?

A subsistence farmer is one who does not produce agricultural goods in big quantities and instead uses what is produced for his or her own consumption rather than small, medium, or large-scale commercialization.

Because just a small number of items are needed to satisfy the producer's demand, this condition negates the need for specialized technology for large-scale production.

Cost efficiency is one advantage of subsistence farming. It does not require the significant capital that a commercial farmer would have otherwise needed, which is the reason. The equipment used is frequently accessible and reasonably priced.

Therefore, the correct option is C. Production is only for family consumption.

To learn more about Subsistence agriculture, refer to the link:

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Please read, and help me

Answers

Answer:

Explanation:

You would take 16-10 to find the missing side length.

The permimiter is the sum of all sides, 16+5+10+6+9+14= 60

In the Nitrogen cycle, how do we as humans (2ways) get nitrogen into our bodies?

Answers

Explanation:

1: Nitrogen fixation

some micro organisms are able to change gaseous nitrogen directly to protein. These micro organisms are in the root nodules of legumes...and ...hey ! we take legumes for food‍♀️

Which option correctly defines gene?

A the part of DNA that affects chromosomes

B a section of DNA that affects traits

C the passing of traits from parent to offspring

D an inherited characteristic​

Answers

Answer:

c

Explanation:

C. the passing of traits from parent to offspring

Summarize the psychological and sociocultural factors that trigger aggressive behavior. Include the frustration-aggression principle, the social learning approach, the impact of culture, and social scripts in your response.
Plz don't put any links as the answer, bcs that isn't helpful. If anyone could help I will give brainliest

Answers

One factor that triggers aggressive behavior is frustration and this is shown through the frustration-aggression principle. This principle states that frustration, the blocking of an attempt to achieve some goal, creates anger. This can generate aggression. Also, previous reinforcement for aggressive behavior, observing an aggressive role model, and poor self-control can all contribute to aggression. The social learning theory is a concept that aims to explain human aggressive through direct observation and imitation. If a child saw their parent act aggressively, they are more likely to imitate this behavior as it is learned through their role model. Social scripts, culturally modeled guides for how to act in various situations, also can trigger aggression. Media portrayals of violence provide social scripts that children learn to follow. Viewing sexual violence contributes to greater aggression towards women. Playing violent video games increases aggressive thoughts, emotions and behaviors. These scenarios display the impact that culture has on one’s aggression.

Answer:

hi im adding answer so the other can get brainliest

Explanation:

...

How do roots help plants meet their needs

Answers

Answer:

The roots help plants in anchoring them to the soil. They also serve as transport systems, allowing the plant to suck up water and dissolved minerals from the soil that it needs to grow. Some plants can store food in roots in the form of carbohydrates (sugars and starches).

Rachel is studying the causes, consequences, and treatments of mental illness. She samples 100 people diagnosed with generalized anxiety disorder. She provides each individual in her sample w
either a new untested drug, a placebo, or a nocebo (which occurs when a person expects negative side effects of a medication), Rachel measures sympathetic nervous system arousal a week bef
and a week after the study. The results of the study appear in the following graph.
70

Answers

Answer:

part a

random assignment ensured each participant had the same chance of being in each group so that means that the results can be more trusted as it leaves less room for data skews based on unfair grouping of participants.

the research method used was an experiment it was not effective, because as shown in the graph the results from the placebo and new drug are the the same so there was no affect on the levels of arousal with the new drug.

elements that limit the generalizability of her study include environmental factors of participants, length of time using drug, small sample size, and limited information about participants. these all affect the generalizability because each of these elements could vary greatly among test and especially in just a 100 person sample size it is hard to conclude that the results will be the same with people everywhere with GAD.

part b two physiological reactions she could have used are increased heart rate and blood pressure because these are typical signs of symptomatic nervous system arousal.

part c GABA blocks impulses between nerves in the brain cells  and with general anxiety disorder there is lots of stimuli's and when GABA is taken it can help create a calming affect  which reduces anxiety and helps people to relaxed rather than be anxious or on edge.

The relationship on the graph is showing that to have a good performance the optimal amount of arousal must be present because having too much arousal, like in many cases in which Rachel is studying, can cause anxiety and stress, and on the other side having not enough arousal can lead to consequences of not being able to sustain attention and lacks motivation.

Explanation:

CAUSES is a project determining the clinical impact of DNA sequencing for undiscovered diseases in British Columbia, and further observations are as follows:

Causes observation:

Random allocation is the way of gathering people into groups based on randomness, intending to produce outcomes that can be attributed to experimental procedures and methodologies at the end of the trial.The research methodology is experimental research, which examines the cause-and-effect relationship and examines the effect of a psychoactive substance through pre-and post-testing. We can see from the graph that a certain drug has a negative effect, while the quasi drug group and placebo have the same effect.As a result, we can conclude that taking any medicine doesn't alleviate anxiety.

Find out more information about the observation here:

brainly.com/question/9679245

Which statement describes the relationship of voltage and current? Voltage is directly proportional to current because I = . Voltage is inversely proportional to current because I = . Voltage is directly proportional to current because I = VR. Voltage is inversely proportional to current because I = VR.

Answers

Answer:

Voltage is directly proportional to current because I =V/R

Explanation:

ASAP PLEASE ANSWER 100 POINTS
A person desires to run for the US House of Representatives.

(A) Describe the process the person must undertake to secure a party nomination.

(B) In the context of the scenario, explain how political action committees influence the process described in part A.

(C) Explain how the process described in part B will affect the behavior of a member of Congress.

Answers

Answer:

Explanation:

(A) To secure a party nomination, there is usually a vote by members of that party. If there are more than one candidate, then the person with the highest number of votes will get the party nomination.

(B) Political action committees are special interest groups with money. They use it to buy TV ads and other promotions for candidates. It makes candidates they support more likely to be nominated.

(C) When a candidate receives support from a PAC, it is more likely the candidate will listen to its opinions. When the candidate is elected to Congress, the PAC will gain influence for its special interest.

Extracting the raw materials through drilling is the first step in the production of oil and gasoline.

True
False

Answers

Answer: pretty sure it's true

Explanation:

AP World History: Modern
Unit 8.3 (Effects of the Cold War) SAQ


Describe TWO governmental units responsible for deciding to invade Cuba.

Explain ONE piece of historical evidence for the failure of the invasion

Describe ONE immediate consequence of the failed invasion.

Answers

The two (2) governmental units that were responsible for deciding the invasion of Cuba include:

Central Intelligence Agency (CIA).Cuban exile brigade.

What is the Cold War?

The Cold War was an open rivalry that developed after World War II and it officially started on the 12th of March, 1947 and ended on the 3rd of December, 1989.

Historically, the Cold War was a geopolitical tension that arose between the United States of America and the Soviet Union, including their respective allies such as the Western Bloc and Eastern Bloc.

The two (2) governmental units that were responsible for deciding the invasion of Cuba include:

Central Intelligence Agency (CIA).Cuban exile brigade.

A piece of historical evidence for the failure of the invasion of Cuba was that Fidel Castro and his advisers knew about the operation and immediately moved their airplanes out of harm’s way.

Consequently, the failed invasion of Cuba inflamed the geopolitical tension between the United States of America, Cuba and the Soviet Union even further.

Read more on the Cold War here: https://brainly.com/question/25774915

Read the excerpt from "Black Hole Beginnings."

As the nuclei meld, a smidgen of their matter vaporizes into energy. This creates a tremendous burst of furious noise, motion, and another by-product: star shine!

Which statement correctly defines the cause-and-effect relationship described in this excerpt?

Motion is the primary cause of furious noise.
Star shine is an effect of matter vaporizing into energy.
A burst of furious noise is an effect of star shine.
Star shine is the primary cause of nuclei melding.

Answers

Answer:

B

Explanation:

Following a comparative dental identification Victor found that the postmortem and antemortem data were a complete mismatch. Which type
of conclusion is this?
A inclusion
B negative identification
C positive identification
D Exclusion

Answers

Answer:

b) Negative Identification

Explanation:

Edmentum

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