half-life
Half life
half life is the time a substance takes to radioactively decay to half of its mass
The time used for dealing with nuclear decay is called a half life. Decay of a radioactive atom is something that happens by change, and the atoms of one isotope may be more or less prone to decay than the atoms of another. The way we normally express the rate of decay is to speak of the amount of time it takes for half of the atoms in a sample to decay, which is the same as the time during which any one atom of the sample has a 50% chance of decaying.
The time depends on the isotope. The half life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years. The half life is the amount of time during which any given atom of the isotope has a 50% chance of undergoing decay. Seen another way, the half life is the time it takes for half the atoms of an isotope in a mass of that isotope to undergo decay.
With radioactive decay, predicting when any individual atom will decay is nearly impossible. However, when a lot a particles are present, then it is possible to get a general idea of how much will decay in a certain period of time. The half-life is this measurement, and it is the time that it takes for one halfof the substance to decay. Hence half-life or how long it takes for half to "die".For any size sample of a substance, the half-life is how long it takes for half to be left, so for a substance with a half-life of 2 days, half of the substance will decay in two days. Therefore your answer is simply half of 30g which is 15g.Additional reading: http://simple.wikipedia.org/wiki/Radioactive_decay
Half life
The time it takes for half the sample to decay is called the half-life.The time it takes for half the sample to decay is called the half-life.The time it takes for half the sample to decay is called the half-life.The time it takes for half the sample to decay is called the half-life.
The time it takes for half of a sample to decay is called the "half-life" of the corresponding material.
half life is the time a substance takes to radioactively decay to half of its mass
The time used for dealing with nuclear decay is called a half life. Decay of a radioactive atom is something that happens by change, and the atoms of one isotope may be more or less prone to decay than the atoms of another. The way we normally express the rate of decay is to speak of the amount of time it takes for half of the atoms in a sample to decay, which is the same as the time during which any one atom of the sample has a 50% chance of decaying.
Plasma decay refers to the time that it takes for the concentration in blood plasma of a substance to reach one-half of its steady-state value. This is also referred to as the plasma half-life.
Physically, the time constant represents the time it takes the system's step response to reach 1-1/e (approx 63.2% of its final value). In radioactive decay the time constant is called the decay constant (λ), and it represents both the mean lifetime of a decaying system (such as an atom) before it decays, or the time it takes for all but 36.8% of the atoms to decay. For this reason, the time constant is reciprocal of mean life.
okay
No, it has a half-life* of around 4.468 billion years *A Half-life is the time it takes for the amount of substance undergoing decay to half.
The time depends on the isotope. The half life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years. The half life is the amount of time during which any given atom of the isotope has a 50% chance of undergoing decay. Seen another way, the half life is the time it takes for half the atoms of an isotope in a mass of that isotope to undergo decay.
With radioactive decay, predicting when any individual atom will decay is nearly impossible. However, when a lot a particles are present, then it is possible to get a general idea of how much will decay in a certain period of time. The half-life is this measurement, and it is the time that it takes for one halfof the substance to decay. Hence half-life or how long it takes for half to "die".For any size sample of a substance, the half-life is how long it takes for half to be left, so for a substance with a half-life of 2 days, half of the substance will decay in two days. Therefore your answer is simply half of 30g which is 15g.Additional reading: http://simple.wikipedia.org/wiki/Radioactive_decay
It tells what fraction of a radioactive sample remains after a certain length of time.