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All the people in the world are of the same age this year! This year is special. It happens only once every 1, years. For example, you are 55 years old and you were born in , which adds up to Very strange, even the Chinese and foreign masters can not explain. Please calculate and see if the answer is Good shot!

## K-Ar dating calculation

Subscriber Account active since. At that point in a selection process, you’ll have gathered enough information to make an informed decision, but you won’t have wasted too much time looking at more options than necessary. A common thought experiment to demonstrate this theory — developed by non-PC math guys in the s — is called “The Secretary Problem. In the hypothetical scenario, you can only screen secretaries once.

If you reject a candidate, you can’t go back and hire them later since they might have accepted another job.

The mathematical expression that relates radioactive decay to geologic time is: [latex]D={D}_{0}+N(t)({e}^{\lambda t}-1)[/latex]. Here, t is age of the sample; D is.

How to use i. Click For Answer! How young is too young to hook up with someone? Do the math. The age , here, is usually the man’s. Because double standards. The rule was so well-known by the s that even Malcolm X is quoted as being a staunch believer in half your age plus seven. Many decades later, the rule remains widespread. In the s, the online dating platform OkCupid also released data on age ranges that people entered when asked about their preferred partner.

Men, as it happens, roughly followed the half your age plus seven rule when it came to lowest age that they would consider in a partner … except for dudes in the mids, who were a little bit too interested in girls in the early 20s. Half your age plus seven has been used quite often over the years in dating and dating advice as an easy rule of thumb some like to follow to determine if it is a good idea—that is, appropriate or creepy—to hook up.

Some relationship experts uphold the general value and decency of half your age plus seven while others critique it for 1 perpetuating male-centric age disparities in relationships, 2 stigmatizing older women as less desirable, and 3 washing over the importance of compatibility and other personal qualities to a relationship. Still, women also may apply the rule for themselves and men may attempt to use it to steer their bros away from predatory, if not statutory, encounters.

## The Age of the Earth

But all the same, being able to estimate quantities that you have no hope of verifying is an important skill for any scientist. How many women are there who live near me? Personally, I think that he is being a little picky. Maybe the numbers should go a little more like this:. How many people of the right gender are there who live near me? But there is another issue.

In it, Blouet’s mathematical formula applied to the ideal age of a bride as Over the s, half your age plus seven became a popular dating.

Radiometric dating is a means of determining the “age” of a mineral specimen by determining the relative amounts present of certain radioactive elements. By “age” we mean the elapsed time from when the mineral specimen was formed. Radioactive elements “decay” that is, change into other elements by “half lives. The formula for the fraction remaining is one-half raised to the power given by the number of years divided by the half-life in other words raised to a power equal to the number of half-lives.

If we knew the fraction of a radioactive element still remaining in a mineral, it would be a simple matter to calculate its age by the formula. To determine the fraction still remaining, we must know both the amount now present and also the amount present when the mineral was formed. Contrary to creationist claims, it is possible to make that determination, as the following will explain:.

By way of background, all atoms of a given element have the same number of protons in the nucleus; however, the number of neutrons in the nucleus can vary. An atom with the same number of protons in the nucleus but a different number of neutrons is called an isotope. For example, uranium is an isotope of uranium, because it has 3 more neutrons in the nucleus.

It has the same number of protons, otherwise it wouldn’t be uranium. The number of protons in the nucleus of an atom is called its atomic number. The sum of protons plus neutrons is the mass number. We designate a specific group of atoms by using the term “nuclide.

## Radiocarbon dating

The following operators are supported in Survey :. The following functions are supported in Survey :. Checks if answer is selected. Returns the number of selected answers. Returns a value if the expression is not evaluated. Returns a random value between 0 inclusive and 1 exclusive.

How we know the age of the Earth. Several radioactive nuclides exist in nature with half-lives long enough to be useful for geologic dating. If you think about it, the equation above is a lot like the formula for a line, y=mx+b.

You may have heard that the Earth is 4. This was calculated by taking precise measurements of things in the dirt and in meteorites and using the principles of radioactive decay to determine an age. This page will show you how that was done. Radioactive nuclides decay with a half-life. If the half-life of a material is years and you have 1 kg of it, years from now you will only have 0. The rest will have decayed into a different nuclide called a daughter nuclide.

Several radioactive nuclides exist in nature with half-lives long enough to be useful for geologic dating. This nuclide decays to Strontium Sr87 with a half-life of Imagine going way back in time and looking at some lava that is cooling to become a rock. This is shown schematically in Figure 1. At this point, its radiometric clock starts ticking.

## The Dating Equation: ½(your age) + 7

Math [ Privacy Policy ] [ Terms of Use ]. I am a grade 9 student. In three years he will be twice as old as she is.

The age can then be calculated from equation (1). In spite of the fact that it is a gas, the argon is trapped in the mineral and can’t escape. (Creationists claim that.

Megan is upset because she is apparently older than 26, and among people who marry, half do so below The intuitive conclusion is that the number of potential partners is decreasing as time goes on. The Half Plus Seven Rule is an unwritten rule that asserts that it is creepy to date anyone who is younger than half your age plus 7 years. As the graph shows, there is a lower limit and an upper limit. As age increases, the age range of potential non-creepy partners widens. At 26, the range of non-creepy partners is 18 years to year-olds.

At 50, it is 54 years 32 to 86 years old. At age 14, you can only date people your own age. The same also works with infinity, but even Methuselah died once. While the application of this rule actually reduces the number of potential matches further, Cueball presents it in a positive way.

## Half Life Calculator

Two things: the somewhat random-looking picture above is from The Moon Is Blue, a film that’s the first known reference to the ‘dating rule’ discussed here. Secondly, I don’t make any judgement about the validity of the ‘dating rule’ – you might find it a useful rule of thumb or a ludicrous restriction; I find it a nice thing to do some algebra on. There is a so-called rule about dating: the youngest age you are supposed to date is half your age plus seven.

Miraculous we all the same age today add ur age with your date of birth n it will come to Happy B’day to all. Today the whole world is the.

Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates. It is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and it can be used to date a wide range of natural and man-made materials.

The best-known radiometric dating techniques include radiocarbon dating, potassium-argon dating, and uranium-lead dating. By establishing geological timescales, radiometric dating provides a significant source of information about the ages of fossils and rates of evolutionary change, and it is also used to date archaeological materials, including ancient artifacts. The different methods of radiometric dating are accurate over different timescales, and they are useful for different materials.

In many cases, the daughter nuclide is radioactive, resulting in a decay chain. This chain eventually ends with the formation of a stable, nonradioactive daughter nuclide. Each step in such a chain is characterized by a distinct half-life. In these cases, the half-life of interest in radiometric dating is usually the longest one in the chain.

This half-life will be the rate-limiting factor in the ultimate transformation of the radioactive nuclide into its stable daughter s. Systems that have been exploited for radiometric dating have half-lives ranging from only about 10 years e. However, in general, the half-life of a nuclide depends solely on its nuclear properties and is essentially a constant.

## 17.6: Radiocarbon Dating: Using Radioactivity to Measure the Age of Fossils and Other Artifacts

Archaeologists use the exponential, radioactive decay of carbon 14 to estimate the death dates of organic material. The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles. Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon. At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.

a groundwater age obtained using 14c-tracer data and the radioactive decay equation would be called a ‘tracer based model age’ or more specifically a ’14c.

The following tools can generate any one of the values from the other three in the half-life formula for a substance undergoing decay to decrease by half. Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value. The term is most commonly used in relation to atoms undergoing radioactive decay, but can be used to describe other types of decay, whether exponential or not. One of the most well-known applications of half-life is carbon dating.

The half-life of carbon is approximately 5, years, and it can be reliably used to measure dates up to around 50, years ago. The process of carbon dating was developed by William Libby, and is based on the fact that carbon is constantly being made in the atmosphere. It is incorporated into plants through photosynthesis, and then into animals when they consume plants. The carbon undergoes radioactive decay once the plant or animal dies, and measuring the amount of carbon in a sample conveys information about when the plant or animal died.

This relationship enables the determination of all values, as long as at least one is known.