There are numerous formules that utilize half life to make various calculations. Primarily, knowing the original amount of a substance and half life can allow for the measurement of current decay progress or knowing the original amount and rate of decay can allow for the calculation of a substance's half-life.

2018年5月22日 · Actually all isotopes are radioactive Some are much more radioactive than others. The second law of thermodynamics states that everything goes from order to disorder. An atomic atom is a highly order structure. The second law states that all highly order structure with break apart and move towards disorder. ( Someday far in the distance future there will be total …

2015年2月19日 · So radioactive DNA probes are basically single strands of DNA or RNA with a radioactive tag. Their sequence is usually the complementary of a single sequence of DNA that researchers want to find in an array of other DNA (such as a gene). So they tag this probe, and release it. They track it to see where it binds in the array of DNA. Once it binds, they know …

2015年5月29日 · Carbon-14 is radioactive because it has too many neutrons for the number of protons. > The principal factor that determines whether a nucleus is stable is the neutron to proton (n:p) ratio. The diagram below plots the number of neutrons versus the number of protons in the first 15 elements. The black squares represent stable isotopes. They are called the band of …

2017年3月31日 · Pro radioactive dating gives an absolute age for the rocks dated. Con radioactive dating can only be used to date fossils older than approximately 50,000 years old. Pro The half life of radioactive substances are empirically determined. The ratio of the parent to daughter atoms can be used to determine an exact age given the assumptions that none of …

2016年6月21日 · Radioactive decay. Radioactive disintegration is synonym for radioactive decay. This occurs when an atom has an unfavourable or unstable combination of protons en neutrons in its nucleus and/or has excess energy. Radioactive decay is a spontaneous process in which the ubstable nucleus emits its excess energy in the form of radiation . You can say that the …

2016年2月11日 · Biology Origin of Life on Earth Radioactive Carbon Dating. 1 Answer Abdul Sammad Feb 11, 2016 Oxygen-15 ...

2014年4月1日 · Half-life is the time it takes for one-half of the atoms of a radioactive material to disintegrate. Scientists can use the half-life of carbon-14 to determine the approximate age of organic objects. They determine how much of the carbon-14 has transformed. They can then calculate the age of a substance. All nuclear reactors produce radioactive ...

2016年2月15日 · nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus. 2.nuclear fission is a process in which the nucleus of an atom splits into smaller parts (lighter nuclei). The fission process often produces free neutrons and gamma photons, and releases a very large amount …

2015年12月5日 · As you know, a radioactive isotope's nuclear half-life tells you exactly how much time must pass in order for an initial sample of this isotope to be halved. The equation that establishes a relationship between the initial mass of a radioactive isotope, the mass that remains undecayed after a given period of time, and the isotope's half-life ...