Table of Contents

- 1 What is the amount of time it takes for half of an isotope in a sample to decay into a different element?
- 2 What is the time needed for half of a sample of a radioactive substance to undergo radioactive decay?
- 3 What is the time it takes one-half of the nuclei in a sample of a radioactive isotope to decay called?
- 4 When should a long half-life versus a short half-life isotope be used for dating?
- 5 What is the formula for nuclear half-life?
- 6 What is the half life of a radioactive substance?

## What is the amount of time it takes for half of an isotope in a sample to decay into a different element?

Explanation: The “half-life” of a sample of radioactive isotope is defined as the amount of time it takes for half of the nuclei in the sample to decay. For example, Carbon-14 is a naturally-occurring radioactive isotope of carbon, with a half-life of around 5700 years.

## What is the time needed for half of a sample of a radioactive substance to undergo radioactive decay?

half-life

Decay Rate The half-life (t1/2) is the time taken for the activity of a given amount of a radioactive substance to decay to half of its initial value.

**Is the time required for ½ of a parent to decay into a daughter material?**

Rutherford and Soddy (1902) discovered that the rate of decay of a radioactive isotope depends on the amount of the parent isotope remaining. Later it was found that half of the parent atoms occurring in a sample at any time will decay into daughter atoms in a characteristic time called the half-life.

**When radioactive isotopes break down that time is referred to as?**

Half life. The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope.

### What is the time it takes one-half of the nuclei in a sample of a radioactive isotope to decay called?

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 …

### When should a long half-life versus a short half-life isotope be used for dating?

Radioisotopes with longer half-lives are used to date older specimens, and those with shorter half-lives are used to date younger ones. Carbon-14 dating is used to date specimens younger than about 60,000 years old. It is commonly used to date fossils of living things and human artifacts.

**What is the half life of the parent isotope?**

A rock sample contains 75 atoms of a parent isotope and 25 atoms of a daughter isotope. The half-life of the parent isotope is 100 years. How old is this rock?

**How long does it take for a radioactive isotope to decay?**

Let’s say you have a radioactive isotope that undergoes radioactive decay. It started from a mass of 67.0 g and it took 98 years for it to reach 0.01 g. Here’s how you would determine its half-life:

## What is the formula for nuclear half-life?

Nuclear half-life expresses the time required for half of a sample to undergo radioactive decay. Exponential decay can be expressed mathematically like this: #A(t) = A_0 * (1/2)^(t/t_(“1/2”))# (1), where. #A(t)# – the amount left after t years;

## What is the half life of a radioactive substance?

Half-life is defined as the amount of time that it takes for radioactive substance to loose half its radioactivity. If a substance has a half life of 58 years and starts with 500 g radioactive, how much remains radioactive after 30 years?