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 of the following identifies three potential problems with solar energy?

high start-up costs, greenhouse gas emissions, and disruption of the ecosystem
deforestation, greenhouse gas emissions, and disruption of the ecosystem
high start-up costs, deforestation, and greenhouse gas emissions
high start-up costs, deforestation, and disruption of the ecosystem

Answers

Answer:

high start up costs

and hard to produce

Explanation:

because uts expensive and hard to make the solar panel

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:

Which of the following best explains a trading relationship between two countries based on comparative advantage?

A- One country exports raw materials and the other country exports manufactured goods, resulting in a global economic balance.

B- One country implements tariffs on goods that are imported from another country because the importing country will benefit from profits on the sale of the goods.

C- Each country specializes in the type of good for which it has the lowest opportunity cost, resulting in a higher global output of both types of goods.

D- Two countries trade in luxury items, but the volume of trade is limited by the highest cost of long-distance trade.

E- Each country exports the same type of good because the countries are similar in terms of natural resources and labor costs.

Answers

Answer:

The answer is C

Explanation:

I don't know why but that was the answer

One way that companies misrepresent themselves about scholarship opportunities in an effort to gain the trust of students is to:

A: Offer scholarships that do not exist
B: Offer additional financing
C:Promise 100 percent success rates
D:Claim they represent the government

Answers

Answer:

ima go with A

Explanation:

Answer:ITS D JUST FINISHED

Explanation:

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.


According to Christaller's central place model, which of the following would most likely have the smallest range?
A. A university
B. An international airport
C. A grocery store
D. A professional football stadium
E. A symphony orchestra hall

Answers

Answer:

C. A grocery store

Explanation:

its closest to the consumers and the market

According to Christaller's central place model, a grocery store would most likely have the smallest range. Thus, option C is correct.

What is Burgess's concentric zone theory?

Burgess's concentric zone theory is a model that describes the growth of a city in a series of wedges out from the central business center. The model proposes that cities develop in concentric circles, with the central business district at the center, surrounded by a zone of transition, then a zone of working-class housing, followed by a zone of middle-class housing, and finally, a zone of suburban commuter residences.

The model was first developed in the 1920s by sociologist Ernest Burgess and has been used to understand urban development and patterns of residential segregation. While the model has been criticized for oversimplifying urban development and not taking into account factors such as race and ethnicity, it has been influential in the field of urban sociology.

Therefore, According to Christaller's central place model, a grocery store would most likely have the smallest range. Thus, option C is correct.

Visit here to learn more about sociologist on: brainly.com/question/30491834

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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:

brainly.com/question/23607115

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