to a quite good approximation
31Magnet — This article is about objects and devices that produce magnetic fields. For a description of magnetic materials, see magnetism. For other uses, see Magnet (disambiguation) …
32Gravitational wave — In physics, a gravitational wave is a fluctuation in the curvature of spacetime which propagates as a wave, traveling outward from a moving object or system of objects. Gravitational radiation is the energy transported by these waves. Important… …
33Multijunction photovoltaic cell — Multi junction solar cells or tandem cells are solar cells containing several p n junctions. Each junction is tuned to a different wavelength of light, reducing one of the largest inherent sources of losses, and thereby increasing efficiency.… …
34Threshold displacement energy — The threshold displacement energy Td is the minimum kinetic energy that an atom in a solid needs to be permanently displaced from its lattice site to a defect position. It is also known as displacement threshold energy or just displacement energy …
35Coupled cluster — Electronic structure methods Tight binding Nearly free electron model Hartree–Fock method Modern valence bond Generalized valence bond Møller–Plesset perturbation theory …
36No hair theorem — The no hair theorem in astrophysics postulates that all black hole solutions of the Einstein Maxwell equations of gravitation and electromagnetism in general relativity can be completely characterized by only three externally observable classical …
37Grade (education) — GPA redirects here. For other uses, see GPA (disambiguation). Academic grading Africa Egypt • Kenya • Morocc …
38Non-equilibrium thermodynamics — Thermodynamics …
39No-hair theorem — The no hair theorem postulates that all black hole solutions of the Einstein Maxwell equations of gravitation and electromagnetism in general relativity can be completely characterized by only three externally observable classical parameters:… …
40Network analysis (electrical circuits) — Linear Network Analysis Elements …
