F3

Technology / Home Audio / F3: The frequency at which the acoustic power output from a system has fallen to one-half its reference value. Known as the systems 3db down point. F3: determined by the frequency at which the output is 3db lower than the level at 100Hz. This frequency was chosen because it is a typical crossover point. In the case of a Bandpass system, F3 is determined by the frequency at which the output is 3db lower than the level at the middle of the pass band. (Measured In Hz)

Curium (Cm)

Science / Periodic Table of Elements / Curium (Cm): Atomic number: 96, Atomic mass: (247) g.mol -1, Electronegativity: unknown, Density: 13.51 g.cm-3 at 20°C, Melting point: 1340 °C, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: MORE

Uranium (U)

Science / Periodic Table of Elements / Uranium (U): Atomic number: 92, Atomic mass: 238.03 g.mol -1, Electronegativity: 1.7, Density: 18.95 g.cm-3 at 20°C, Meltin point: 1132 °C, Boiling point: 3818 °C, Vanderwaals radius: 0.121 nm, Ionic radius: 0. MORE

Scandium (Sc)

Science / Periodic Table of Elements / Scandium (Sc): Atomic number: 21, Atomic mass: 44.9559 g.mol -1, Electronegativity: unknown, Density: 3.0 g.cm-3 at 20°C, Melting point: 1541 °C, Boiling point: 2836 °C, Vanderwaals radius: 0.161 nm, Ionic radius MORE

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