# The Half Life Of A Certain Radioactive Material Is 78 Hours

## The Half-Life Of A Certain Radioactive Material Is 78 Hours

The half-life of a certain radioactive material is 78 hours. An initial amount of the material. half life i= 78 hours amount after 78 hours is 395 kg:

## What is half-life radioactive material?

half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive.

## How is the half-life of radioactive materials used?

The half-life of an isotope is used to describe the rate at which the isotope will decay and give off radiation. Using the half-life, it is possible to predict the amount of radioactive material that will remain after a given amount of time.

## What is the half-life of a material?

The term half-life is defined as the time it takes for one half of the atoms of a radioactive material to disintegrate. Half-lives for various radioisotopes can range from a few microseconds to billions of years.

## What is the half-life of a radioactive nucleus?

The longer the half-life of a nucleus, the lower the radioactive activity. A nucleus with a half-life that is a million times greater than another will be a million times less radioactive. A ‘half-life’ is defined as the amount of time taken for the number of nuclei present in a sample at a given time to exactly halve.

## Why is it called a half-life?

The Basics. A half-life is a time taken for something to halve its quantity. The term is most often used in the context of radioactive decay, which occurs when unstable atomic particles lose energy. Twenty-nine elements are known to be capable of undergoing this process.

## What occurs during half-life?

The half-life of a radioactive isotope is the amount of time it takes for one half of the radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.

## What is the definition of a half-life Quizlet?

Half-life definition. the average time it takes for the number of nuclei in a radioactive isotope sample to halve. the radioactivity of a sample always. decreases over time.

## Why is half-life important in radioactive decay?

In a nutshell, the radiological half-life is important in radiation control because long-lived radionuclides, once released, are around for longer time periods than are shorter-lived species. Long-lived radionuclides released to the environment will be present for longer times than short-lived nuclides.

## What is half-life in chemistry in simple terms?

The half-life of a chemical reaction can be defined as the time taken for the concentration of a given reactant to reach 50% of its initial concentration (i.e. the time taken for the reactant concentration to reach half of its initial value).

## What is the half-life of a reaction?

The half-life of a reaction is the time required for a reactant to reach one-half its initial concentration or pressure. For a first-order reaction, the half-life is independent of concentration and constant over time.

## What is the unit of half-life?

The units of half-life are time. The half-life is the length of time that it takes for half of an initial sample to undergo a change. Usually, this is the radioactive decay of a specific atomic weight of an element. For example, the half-life of Uranium-238 is 4.46 billion years.

## How long is the half-life of radiation?

The time that it takes for half of the radioactive atoms to decay is called a half-life. For example, the previously mentioned technetium-99m has a half-life of six hours which means that starting with 100 percent, after six hours, we will have 50 percent left.

## What does half-life mean in radioactivity?

The time required for half the atoms of a particular radioisotope to decay into another isotope. A specific half-life is a characteristic property of each radioisotope. Measured half-lives range from millionths of a second to billions of years, depending on the stability of the nucleus.

## Why do we measure half-life?

Scientists measure the half-life of a substance because it tells them about the amount of radiation that a given substance will give off. Half-life is a fixed constant for every different substance, allowing experts to accurately predict the lifespan of the material.

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