[Answer] Which best describes nuclear fission?

Answer: A nucleus collides with a neutron and splits releasing energy.
Which best describes nuclear fission?

In nuclear physics and nuclear chemistry nuclear fission is a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into two or more smaller lighter nuclei. The fission process often produces gamma photons and releases a very large amount of energy even by the energetic standards of radioactive decay. Nuclear fission of heavy elements was discovered on …

In nuclear physics and nuclear chemistry nuclear fission is a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into two or more smaller lighter nuclei. The fission process often produces gamma photons and releases a very large amount of energy even by the energetic standards of radioactive decay. Nuclear fission of heavy elements was discovered on December 17 1938 by German Otto Hahn and his assistant Fritz Strassmann at the suggestion of Austrian-Swedish physicist Lise Meitner who explained it theoretically in January 1939 along with her nephew Otto Robert Frisch. Frisch named the process by analogy with biological fission of living cells. For heavy nuclides it is an exothermic reaction which can release large amounts of energy both as electromagnetic radiation and as kinetic energy of the fragments (heating the bulk material where fission takes place). Like nuclear fusion in order for fission to produce energy the total binding energy of the resulting elements must have a greater binding energy than that of the starting element. Fission is a form of nuclear transmutation because the resulting fragments are not the same element as the original atom. The two (or more) nuclei produced are most often of comparable but slightly different sizes typically with a mass ratio of products of about 3 to 2 for common fissile isotopes. Most fissions are binary fissions (producing two charged fragments) but occasionally (2 to 4 times per 1000 events) three positively charged fragments are produced in a ternary fission. The smallest of these fragments in ternary processes ranges in size from a proton to an argon nucleus. Apart from fission induced by a neutron harnessed and exploited by humans a natural form of spontaneous radioactive decay (not requiring a neutron) is also referred to as fission and occurs especially in very high-mass-number isotopes. Spontaneous fission was discovered in 1940 by Flyorov Petrzhak and Kurchatov in Moscow in an experiment intended to confirm that without bom… Read more on Wikipedia

Mechanism Radioactive decay Nuclear fission can occur without neutron bombardment as a type of radioactive decay . This type of fission (called spontaneous fission ) is rare except in a few heavy isotopes.

Mechanism Radioactive decay Nuclear fission can occur without neutron bombardment as a type of radioactive decay . This type of fission (called spontaneous fission ) is rare except in a few heavy isotopes. Nuclear reaction In engineered nuclear devices essentially all nuclear fission occurs as a ” nuclear reaction ” — a bombardment-driven process that results from the collision of two subatomic particles. In nuclear reactions a subatomic particle collides with an atomic nucleus and causes changes to it. Nuclear reactions are thus driven by the mechanics of bombardment not by the relatively constant exponential decay and half-life characteristic of spontaneous radioactive processes. Many types of nuclear reactions are currently known. Nuclear fission differs importantly from other types of nuclear reactions in that it can be amplified and sometimes controlled via a nuclear chain reaction (one type of general chain reaction ). In such a reaction free neutrons released by each fission event can trigger yet more events which in turn release more neutr…

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