natural frequency basâmad-e zâstâri Fr.: fréquence naturelle Any frequency of small-amplitude oscillation for a system with a position of stable equilibrium and in the absence of external forces. In other words, the frequency of → free oscillation. Also called characteristic frequency. |
Nyquist frequency basâmad-e Nyquist Fr.: fréquence de Nyquist The highest frequency that can be determined in a Fourier analysis of a discrete sampling of data. → Nyquist formula; → frequency. |
plasma frequency basâmad-e plâsmâ Fr.: fréquence de plasma The natural frequency at which internal oscillations of a plasma occur. The plasma frequency is proportional to the square root of the electron density. → plasma oscillation. |
quench frequency basâmad-e osereš Fr.: fréquence de découpage The frequency at which an oscillation is intermittently quenched, as in a super-regenerative receiver. |
radio frequency basâmad-e râdio-yi (#) Fr.: fréquence radio The → electromagnetic radiation with the frequency range between 3 → kiloherz (kHz) to 300 → gigahertz (GHz). See also → radio wave. |
relative frequency basâmad-e bâzâni Fr.: fréquence relative Statistics: The number of the occurrences of an event divided by the number of observations. |
resonance frequency basâmad-e bâzâvâyi Fr.: fréquence de résonance The frequency at which a system is in → resonance. |
rotation frequency basâmad-e carxeš Fr.: fréquence de rotation 1) The number of rotations per unit time of a rotating object. |
synchrotron frequency basâmad-e sinkrvtrvn Fr.: fréquence synchrotron The revolution frequency of a → relativistic particle of charge q and mass m in the → uniform magnetic field B of a synchrotron. It is expressed by: f_{syn} = qB/2πγm, where γ is the → Lorentz factor. This frequency is lower than → cyclotron frequency for a → non-relativistic case. → synchrotron; → frequency. |
vibrational frequency basâmad-e šiveši (#) Fr.: fréquence de vibration, ~ vibrationnelle The frequency at which the atoms in a molecule vibrate. The frequencies of → molecular vibrations in diatomic molecules are in the order of 10^{-12} to 10^{-14} Hz. In such molecules, the only → vibrational mode available is along the bond. More complicated molecules have many types of vibration and stretching modes. → vibrational; → frequency. |