For an oscillating or varying current , frequency is the number of complete cycles per second in alternating current direction. The standard unit of frequency is the hertz , abbreviated Hz. If a current completes one cycle per second, then the frequency is 1 Hz; 60 cycles per second equals 60 Hz the standard alternating-current utility frequency in some countries. Larger units of frequency include the kilohertz kHz representing thousands 1,'s of cycles per second, the megahertz MHz representing millions 1,,'s of cycles per second, and the gigahertz GHz representing billions 1,,,'s of cycles per second. Note that these prefixes represent specific powers of 10, in contrast to the prefixes for multiples of bytes, which represent specific powers of 2. Computer clock speed is generally specified in megahertz and, more recently, in gigahertz. Frequency is important in wireless communications, where the frequency of a signal is mathematically related to the wavelength. If f is the frequency of an electromagnetic field in free space as measured in megahertz, and w is the wavelength as measured in meters, then.
What is frequency?
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Frequency , in physics , the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion. A body in periodic motion is said to have undergone one cycle or one vibration after passing through a series of events or positions and returning to its original state. See also angular velocity ; simple harmonic motion. In general, the frequency is the reciprocal of the period, or time interval; i. The frequency with which the Moon revolves around Earth is slightly more than 12 cycles per year. The frequency of the A string of a violin is vibrations or cycles per second. Nu is used more often when specifying electromagnetic waves , such as light , X-rays , and gamma rays. Omega is usually used to describe the angular frequency—that is, how much an object rotates or revolves in radians per unit time. Usually frequency is expressed in the hertz unit, named in honour of the 19th-century German physicist Heinrich Rudolf Hertz , one hertz being equal to one cycle per second, abbreviated Hz; one kilohertz kHz is 1, Hz, and one megahertz MHz is 1,, Hz.
Frequency is the number of occurrences of a repeating event per unit of time. Frequency is measured in units of hertz Hz which is equal to one occurrence of a repeating event per second. The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals sound , radio waves , and light. For cyclical processes, such as rotation , oscillations , or waves , frequency is defined as a number of cycles per unit time.
That frequency is within the range used by amateur radio operators, so anyone can listen in. One of the biggest concerns in Europe is the frequency of air traffic with West Africa. Despairing about the length and frequency of the many fashion weeks has become a tired refrain. Greenberg also indicates that the frequency of splurges can change depending on where you are in relation to your goal.