certainty tâštigi (#) Fr.: certitude The fact, quality, or state of being certain, especially on the basis of evidence. Something that is certain. → uncertainty; → uncertainty principle. Noun from → certain. |
Heisenberg uncertainty principle parvaz-e nâtâštigi-ye Heisenberg Fr.: principe d'incertitude de Heisenberg The uncertainty in the measurement of the position and momentum of an elementary particle. The more precisely one quantity is known, the less certain the precision of the other. A similarly linked pair of quantities is the time and energy content in a volume of space. Named after Werner Heisenberg (1901-1976), the German physicist who in 1927 derived the uncertainty principle. In 1932 he was awarded the Nobel Prize in Physics; uncertainty, from → un- "not" + → certainty; → principle. |
measurement uncertainty nâtâštigi-ye andâzegiri Fr.: incertitude de mesure The interval within which lies the actually measured value of a physical quantity and the true value of the same physical quantity. → measurement; uncertainty, from negation prefix un- + → certainty. |
uncertainty nâtâšigi (#) Fr.: incertitude The state of being uncertain; unpredictability; indeterminacy. → uncertainty principle. |
uncertainty principle parvaz-e nâtâštigi Fr.: principe d'incertitude A quantum mechanical principle due to Werner Heisenberg which states that the position and momentum of a particle cannot be determined simultaneously with any arbitrary accuracy. These quantities can be determined only with accuracies limited by the relation Δx.Δp ≥ (1/2)ħ, where Δx is the error in the determination of the position and Δp is the error in the momentum. A similar relation holds for the energy of a particle and the time, ΔE.Δt ≥ (1/2)ħ. Same as → Heisenberg uncertainty principle. → uncertainty; → principle. |