What is Nuclear Chain Reaction?

Nuclear chain reaction is a sequence of single nuclear reactions, each of which is caused by a particle that appeared as a reaction product at the previous step of the sequence. An example of a nuclear chain reaction is the nuclear chain reaction of the fission of nuclei of heavy elements, in which the majority of fission events are initiated by neutrons produced by nuclear fission in the previous generation.

Chain reactions are widespread among chemical reactions, where free atoms or radicals play the role of particles with unused bonds. The mechanism of the nuclear chain reaction in nuclear transformations can provide neutrons that do not have a Coulomb barrier and excite the nucleus during absorption. The appearance of the necessary particle in the medium causes a chain of the following, one after the other reactions, which continues until the chain breaks due to the loss of the carrier particle of the reaction.

What is Newton's Ring? How it works & usages?

Newton's rings are ring-shaped interference maximum and minimum seeming around the point of tang ency of a marginally curved convex lens and a plane-parallel plate as light permits through the lens and plate.

The interference pattern in the form of rings happens when light is mirrored from two surfaces, one of which is flat, and the other has a moderately large radius of curvature and comes into contact. If a beam of homo chromatic light is event on such a system in a direction erect to the plane surface, then the light waves reflected from each of these surfaces interfere with each other. The interference pattern shaped in this way comprises of the surfaces of a dark circle witnessed in the place of contact and the neighboring light and dark concentric rings surrounding it.

What is string theory?

The direction of theoretical physics that studies the dynamics of the connections are not point particles and the one-dimensional comprehensive objects, the so-called quantum strings. String theory combines the ideas of quantum mechanics and relativity theory, therefore, based on it, may be to build a future theory of quantum gravity.

String theory is based on the hypothesis that all elementary particles and their fundamental interactions are the result of vibrations and interactions ultramicroscopic quantum strings on the scales of the order of the Planck length 10 -35 m. This approach, on the one hand, to avoid such difficulties, quantum field theory, a renormalization, on the other hand, leads to a deeper view of the structure of matter and space-time.