Table of Contents

- 1 What is the half-life of Alpha?
- 2 How do you find the half-life of alpha decay?
- 3 How long is bismuth 209 half-life?
- 4 What is the daughter element?
- 5 Which has longest half-life?
- 6 What is the longest half-life isotope?
- 7 What is parent nuclide?
- 8 What is the formula for calculating half life?
- 9 How do you calculate half life in chemistry?
- 10 How is half life calculated?

## What is the half-life of Alpha?

Half-lives for alpha decay range from about a microsecond (10−6 second) to about 1017 seconds (over 3 billion years).

## How do you find the half-life of alpha decay?

Let n be the frequency with which the alpha particle collides to escape the nucleus, P be the probability of transmission in each collision. The relation between half-life ( T 1 / 2 ) and decay constant (λ) is given by, T 1 / 2 = 0.693 λ where, λ is the probability of decay per second.

**How do you find the length of a half-life?**

The time taken for half of the original population of radioactive atoms to decay is called the half-life. This relationship between half-life, the time period, t1/2, and the decay constant λ is given by t12=0.693λ t 1 2 = 0.693 λ .

### How long is bismuth 209 half-life?

2.01×1019 years

Bismuth-209

General | |
---|---|

Neutrons | 126 |

Nuclide data | |

Natural abundance | 100% |

Half-life | 2.01×1019 years |

### What is the daughter element?

The element formed when a radioactive element undergoes radioactive decay. The latter is called the parent. The daughter may or may not be radioactive.

**What is the formula for half-life in chemistry?**

The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first-order reaction is a constant that is related to the rate constant for the reaction: t1/2 = 0.693/k.

#### Which has longest half-life?

Bismuth breaks half-life record for alpha decay. Physicists in France have measured the longest ever radioactive half-life – over twenty billion billion years – in a naturally occurring element that decays by emitting alpha-particles.

#### What is the longest half-life isotope?

Bismuth-209

Bismuth-209 (209Bi) is the isotope of bismuth with the longest known half-life of any radioisotope that undergoes α-decay (alpha decay). It has 83 protons and a magic number of 126 neutrons, and an atomic mass of 208.9803987 amu (atomic mass units).

**What is C 14 dating used for?**

Radiocarbon dating is a technique used by scientists to learn the ages of biological specimens – for example, wooden archaeological artifacts or ancient human remains – from the distant past. It can be used on objects as old as about 62,000 years.

## What is parent nuclide?

A nuclide before disintegration is called a parent nuclide and that after disintegration is called a daughter nuclide. A nuclide whose daughter nuclide is energetically unstable repeats disintegration until becoming energetically stable. Radioactive.

## What is the formula for calculating half life?

For a zero-order reaction,the mathematical expression that can be employed to determine the half-life is: t1/2 =[R]/2k

**What is the equation for half lives?**

Mathematically, the half life can be written in terms of the decay rate: Half-life = – ln(2) / k. The natural logarithm (ln) is a mathematical function that is the inverse to the exponential (e) function. You can find the natural logarithm on a scientific calculator where it will be labelled “ln.”.

### How do you calculate half life in chemistry?

The formula for calculation of half-life (T1/2) requires the knowledge of the initial concentration (C1), and the subsequent concentration (C2) obtained an amount of time later (t). The formula is: T1/2 = t / [log2(C1/C2)] Today, there are computer programs that will allow the numbers to be plugged in and the half-life result returned.

### How is half life calculated?

The half-life (t 1/2) of a material can be calculated by dividing 0.693 by the decay constant (which is different for different radionucleotides). The decay constant can be calculated by dividing the number of observed disintegrations per unit time by the number of radioactive nuclei in the sample.