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.
Fr.: fréquence de Nyquist
The highest frequency that can be determined in a Fourier analysis of a discrete sampling of data.
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.
Fr.: fréquence de découpage
The frequency at which an oscillation is intermittently quenched, as in a super-regenerative receiver.
basâmad-e râdio-yi (#)
Fr.: fréquence radio
Fr.: fréquence relative
Statistics: The number of the occurrences of an event divided by the number of observations.
Fr.: fréquence de résonance
The frequency at which a system is in → resonance.
Fr.: fréquence de rotation
1) The number of rotations per unit time of a rotating object.
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: fsyn = qB/2πγm, where γ is the → Lorentz factor. This frequency is lower than → cyclotron frequency for a → non-relativistic case.
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.