An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Physics: The act or process of propagating, especially the process by which a disturbance, such as the motion of electromagnetic or sound waves, is transmitted through a medium such as air or water. Linguistically related notions: → diffusion (پخش); → dispersion(پاشش); → scattering (پراکنش); → diffraction (پراش).

Verbal noun of → propagate.

A parameter, denoted k = 2π/λ, that along with the → angular frequency, ω = 2πν, is used to express the equation of → simple harmonic motion, y = cos (ωt - kx + π/2). Same as → wave number.

→ propagation; → number.

The motion of light in the first approximation, as evidenced from the formation of shadows and other every day experience. However, → diffraction

→ rectilinear; → propagation; → light.