Oscillations, waves and sound

Travelling wave , a wave motion in which the surface of equal phases (phase waves, fronts) moves with a finite velocity.

Moving striations , dark and light layers (strata) that move continuously along the positive column of a glow discharge or an arc discharge.

White noise , acoustic noise in which sound oscillations of different frequencies are represented to an equal degree, that is, the intensities of sound waves of different frequencies are on average approximately the same…

in a plasma, see Landau damping.

Beats , periodic changes in the amplitude of an oscillation that arise when two harmonic oscillations of close frequency are added.

Binaural effect , (from the Latin bini — pair, two, and auris — ear), a psychophysiological phenomenon consisting in the fused perception of the sounds received by the right and the left ear.

Gas dynamics - the branch of fluid mechanics that studies the motion of compressible continuous media (gas, plasma) and their interaction with solid bodies.

Pressure , a physical quantity characterising the intensity of the normal (perpendicular to the surface) forces with which one body acts on the surface of another (for example, the foundation of a building on the ground,…

Zhukovsky's theorem , a theorem on the lift acting on a body in a plane-parallel flow of a liquid or a gas.

A form of modulation of oscillations in which the frequency of a high-frequency oscillation varies in time according to the law of the signal being transmitted.

A form of modulation of oscillations in which the signal being transmitted controls the phase of the carrier HF oscillation.

An obsolete unit of frequency interval. Named after the French physicist F.

(German Oberton, from ober — upper and ton — tone), a sinusoidal component of a periodic oscillation of complex form whose frequency is higher than that of the fundamental tone.

A specially equipped room for acoustic measurements under conditions approaching those of free open space (in a free sound field).

Sound , in the broad sense, is the oscillatory motion of the particles of an elastic medium propagating as waves in gaseous, liquid or solid media— the same as elastic waves; in the narrow sense it is a phenomenon percei…

Focusing of sound and ultrasonic waves (a Russian monograph).