What does the half life decay and what does the half life have to do with?

Half-life is the decay of atomic nuclei.

The reason why the answer to this question is wrong is that the half-life actually says "probability decay to half", and probability only applies in a large number of samples, not necessarily a few.

Therefore, if you take 4 radon nuclei, it is most likely that there will be one radon nucleus left after the day, but it is not certain.

Addendum: It means that so many atoms (e.g. 10,000 nuclei) have a probability (note that it is not a certainty, but a probability) that 5,000 decay. After decay, due to the loss of protons, the nuclei become other nuclei, and they are no longer the original nuclei, so the number of nuclei will be reduced.

The correct answer is: the half-life of radon is days, if you take 4 radon nuclei, there must be 2 radon nuclei left after days.

Half-life is the time it takes for half of the nuclei of radioactive elements to decay.

among others"Half"This means that 5,000 of the atoms (e.g. 10,000 nuclei) decay and the other 5,000 do not.

After decay, the radon nuclei become the nuclei of other elements, so the number of radon nuclei decreases.

On a macroscopic level, it is mass that decays in half-life; In appearance, it is the number of atoms that decays in half-life. But half-life decay is a macroscopic concept, not a few, dozens, but a lot, to reach a similar order of mol to make sense.

Half of the nuclei of radioactive elements take time to decay, which is called half-life.

Quoted from Half-life refers to the statistical law of a large number of actual phenomena.

To calculate, the prerequisite is a large number of molecules, 4, a large number?

Quantities of radioactive elementsNucleus, half of the time it takes for decay to occur, is called the elementHalf-life

The half-life is statistically significant. The half-life is a period of time t, during which there is a 50% probability that the number of atoms of an unstable isotope will decay.

"50% probability" is a statistical concept that only makes sense for a large number of repetitive events. When the number of atoms is "huge", 50% of the atoms will decay in time t.

The half-life is calculated by the formula:

Starting from the definition of half-life, combine the proportional series.

Concept, we know that after n half-lives, the remaining mass is:

m=m(1/2)^(t/t)。

where m is the mass of the nucleus before the reaction, m is the mass of the nucleus after the reaction, t is the reaction time, and t is the half-life. Obviously, n=t t.

Overview:

1) Definition of half-life: Half of the nuclei of a radioactive element take time to decay, which is called the half-life of the element.

2) Significance of half-life: It reflects the statistical speed of the nuclear decay process.

3) The determining characteristic of half-life: it is determined only by the factors of the nucleus itself, and has nothing to do with the physical or chemical state of the atom.

The above content reference: Encyclopedia - Half-Life.

Half-lifeIt has to do with the number of reaction sequences.

If it is a first-order reaction, then the half-life is a fixed value, which is related to its nature, etc. If it is not first-order, then it is also related to its concentration. When a nuclide is determined, its half-life is determined.

The half-life of C12 is a fixed value and does not change due to changes in the environment.

Half-life Einstein's law.

When atoms begin to decay, their number decreases and the rate of decay slows down. For example, if the half-decay of an atom is one hour, after one hour the undecayed atom will be one-half of the original atom, two hours later it will be one-fourth, and after three hours it will be one-eighth of the atom.

The decay of the atom creates another element, which emits alpha particles.

Beta particles or neutrinos.

After decay, the atom also detects the absence and releases rays.

Half-lifeIt has to do with the number of reaction sequences.

If it is a first-order reaction, then the half-life is a fixed value, which is related to its nature, etc. If the fruit is not first-class, then it is also related to its concentration. When a nuclide is determined, its half-life is determined.

The half-life of C12 is a fixed value and does not change due to changes in the environment.

The nature of the half-life is early:In addition, there are many factors that can also affect the half-life of the drug, such as the patient has heart disease.

Hemodynamic changes can lead to reduced blood flow in organs or in certain areas, which in turn will cause some drugs to be eliminated and prolong the half-life of drugs. If the patient has liver and kidney insufficiency, it will also affect the metabolism and elimination of the drug, which will prolong the half-life of the drug.

The relationship between the half-life and the decay constant ( ) is that the digging is a tomb:

t1 2 = half-mourning period: In a statistical sense, the half-life refers to a period of time t, during which there is a 50% probability that an unstable isotope atom of an element will decay.

Decay constant: The decay constant, one of the characteristic quantities that characterize the statistical law of radioactive decay, indicates the probability of decay of one nucleus of a radionuclide of an excited species in a unit of time. Judgment.

Half-lifeThe relation to the decay constant ( ) is the trapped state:

t1 2 = half-mourning period: In a statistical sense, the half-life refers to a period of time t, during which the probability of decay of an unstable isotope of an element is 50%.

Decay constant: The decay constant, one of the characteristic quantities that characterize the statistical law of radioactive decay, represents a nucleus of an atom that relaxes the explosive nuclide.

The chance of decay occurring per unit of time.

=；The smaller the half-life, the greater the decay constant.

Both the half-life and the decay constant are parameters of the decay rate of the reaction slip trapped radionuclide, and the half-life t1 2 indicates the time it takes for half of the nuclei in a radioactive source (which contains a large number of congeneroids) to decay; The decay commotion constant indicates the probability of decay of each nucleus in the radioactive source, and the relationship between the two is: =; The smaller the half-life, the greater the decay constant.

The decay constant ( ) is related to the half-life (t: =; t1/2=。The larger the value, the faster the decay of the slip-ejective elements in the culture, and the shorter the decay period of the semi-leakage tank is to return to the middle tung.

The half-life and decay constant relationship is:

t1/2=

The decay constant ( ) has the following relationship with the half-life (t1 2):

t1/2=。The higher the value, the faster the radioactive element decays and the shorter the half-life.

Decay constant: decay constant, one of the characteristic quantities that characterize the statistical law of radioactive decay, indicates the probability of decay of a nucleus of a certain emissionary nuclide in a unit of time. Half-life

Half of the nuclei of radioactive elements take time to decay.

The decay constant is a characteristic parameter of various radionuclides. Like half-life, it is an indicator of the rate at which a radioactive element decays. The decay phenomenon of radionuclides was observed and counted, and it was found that the exponential decay law and the decay constant could not be changed by physical or chemical means such as pressurization, heating, electromagnetic field, and mechanical movement.

This shows that radioactive decay is determined by the internal motion of the nucleus.

In a statistical sense, the half-life refers to a period of time t, during which there is a 50% probability that an atom of an unstable isotope of an element will decay. "50% probability" is a statistical concept that only makes sense for a large number of repetitive events.

The above content refers to: Encyclopedia - Decay Constant.

Encyclopedia - Half-life.