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Radio frequency ( RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency [1] range from around 20 kHz to around 300 GHz. This is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies, and also ...
In the case of electrical current, frequency is the number of times a sine wave repeats, or completes, a positive-to-negative cycle. The more cycles that occur per second, the higher the frequency. Example: If an alternating current is said to have a frequency of 3 Hz (see diagram below), that indicates its waveform repeats 3 times in 1 second.
Die schnellen CJX-Züge fahren zur Minute 18 vom Westbahnhof ab (Fahrzeit: 36 min). Vom Wiener Hauptbahnhof fahren die RJX zur Minute 28 (Fahrzeit: ab 29 min) und die Railjets zur Minute 55 (Fahrzeit: ab 33 min). Ab Salzburg und Linz geht’s 2x pro Stunde mit dem Railjet nach St. Pölten zum Frequency Festival.
Frequency ist ein Film von Gregory Hoblit mit Jim Caviezel, Dennis Quaid. Synopsis: John Sullivan (James Caviezel), ein gestresster junger New Yorker Polizist, hat sich gerade von seiner großen ...
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz ). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio ...
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However, the frequency usually remains the same because it is like a driven oscillation and maintains the frequency of the original source. If v changes and f remains the same, then the wavelength λ λ must change. Since v = f λ v = f λ, the higher the speed of a sound, the greater its wavelength for a given frequency.
