Nuclear Fission

a moderator would slow the neutrons, hindering breeding

The fission cross section in a nuclear reactor is a measure of the probability that a neutron will induce fission in a particular nucleus. It is a crucial parameter for determining the neutron flux and reaction rates within the reactor core. Different isotopes have different fission cross sections depending on their ability to undergo fission when struck by a neutron.

Fission and fusion reactions are chain reactions but in different ways. In fission reaction a heavy nuclei is bombarded with a slow moving neutron and this nuclei breaks to produce more such neurons along with generation of new elements. These slow moving neutrons are further used to carry out fission of more such nuclei. This is chain reaction.

Fusion reaction are a different class of nuclear reaction in which small nuclei fuse together to produce bigger nuclei along with the generation of energy due to mass defect..

In fusion reaction lot of energy is produced and this energy is used to carry out further reaction. Thus both can be called series reaction.

It becomes energy, hence the energy released in nuclear bombs.

Nuclear fission involves the splitting of a heavy atomic nucleus into smaller nuclei, releasing energy in the process, commonly used in nuclear reactors. In contrast, nuclear fusion is the process where light atomic nuclei combine to form a heavier nucleus, which also releases energy, and is the reaction that powers stars, including the sun. Nuclear decay, on the other hand, refers to the spontaneous transformation of an unstable atomic nucleus into a more stable one, emitting radiation in the process. While fission and fusion are energy-producing reactions, decay is a natural process of radioactive elements.

Lise Meitner primarily utilized advanced experimental techniques in nuclear physics, including the study of radioactivity and the behavior of isotopes. She collaborated with chemist Otto Hahn to analyze radioactive decay products using methods such as radiochemical separation. Meitner also employed theoretical physics concepts to interpret experimental data and contribute to the understanding of nuclear fission. Her work relied heavily on the use of early 20th-century laboratory equipment and techniques available in her time.

I believe that yes, it should occur - assuming any atoms are left. Please note that in the case of a neutron star, most of the atoms are crushed out of existence - i.e., there are no more atoms left, except a few in the outermost layers. Similarly, in a black hole, no atoms will be left.

yes

Loss of reactor coolant results in lack of nuclear fuel cooling and hence melt down results.

That would vary with reactor design, where the original problem occurred, operator training and response to the problem, and many other variables. An accident can vary from a tiny release of radioactive gasses that is stopped immediately, through steam ejection of a fuel rod whch impales a single worker onto the ceiling, through a massive steam explosion followed by a graphite fire (all three of these have happened), to a worst case complete core meltdown that melts down to the water table causing massive contamination of drinking water for hundreds of miles (this has not happened).

Either highly enriched uranium-235 or reactor produced plutonium.

A nuclear power station uses heat given off by the controlled fission of enriched uranium.

The heat is used to boil water, the steam blows through the vanes of a turbine,

and the turbine spins an electrical generator.

The half-life of Cs-137 is 30.08 years, so 0.0038 would remain after 241.84 years.

Nuclear fission happens when the strong nuclear force of an atom has been overcome. It releases a lot of heat, and this is typically used to boil water, to drive turbines, which turn the heat energy into mechanical energy, and this is used to power generators to make electricity.

In order to cause an atomic nucleus to become unstable so that it will undergo fission, you have to add a neutron. If a slow neutron collides with an atomic nucleus, it will be absorbed into the nucleus and become part of it. The nuclear attraction of the nucleus is strong enough to grab a slow neutron. But a fast neutron cannot be captured because it has too much kinetic energy. The attraction of the nucleus is not enough to stop the motion of a fast neutron. Even if a fast neutron makes a direct hit on an atomic nucleus, it is just going to bounce off.

Nuclear fission is exothermic, as it releases a large amount of energy when a heavy nucleus is split into smaller fragments. This energy is usually in the form of heat and can be harnessed for power generation in nuclear reactors.

Yes, as heat and radiation

Nuclear fission actually releases first fission fragments and other particles with kinetic energy, which then turns to heat as the ejected fission fragments and part of the particles are slowed down within the mass of the solid fuel.

The fuel itself is made from uranium dioxide UO2, which is in the form of small cylinders 10 mm in diameter. During manufacture these are sintered to make them physically stronger. The uranium content is enriched in uranium 235 to 4 to 5 percent, the rest is uranium 238 which is not fissile. These fuel cylinders are put into tubes made of a zirconium alloy ('zircaloy') which are then sealed so that gaseous fission products cannot escape. The tubes are assembled into fuel assemblies containing probably more than 100 tubes depending on the reactor design, and these assemblies are handled as units when fuelling or discharging old fuel.

Splitting of atom

A small piece has more surface area compared to its mass; as a result, more neutrons will escape before they can participate in the chain reaction.

The energy production of the sun & the atomic bombs used in world war ll

Nuclear fission