what is the atomic clock
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atomic clock (NIST-F1) An atomic clock is the most accurate type of timepiece in the world, designed to measure time according to vibrations within atom s. NIST-F1, the United States' standard atomic clock, is said to be so accurate that it would neither gain nor lose a second in over 30 million years.
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Atomic mass The atomic mass (ma) is the mass of an atom. Its unit is the unified atomic mass units (symbol: u, or Da) where 1 unified atomic mass unit is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest.
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- Atomic Clocks Very accurate clocks can be constructed by locking an electronic oscillator to the frequency of an atomic transition. The frequencies associated with such transitions are so reproducible that the definition of the second is now tied to the frequency associated with a transition in cesium-133:
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- Iodine clock reaction. Iodine clock reaction (persulfate variation) The iodine clock reaction (also known as the Harcourt-Esson reaction or the Harcourt-Essen reaction) is a classical chemical clock demonstration experiment to display chemical kinetics in action; it was discovered by Hans Heinrich Landolt in 1886.
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Clock A clock is a device that tells the time. Some clocks can give the date as well as the time and a few give other information. There are different types of clocks. A watch is a type of clock that is small and can be carried. Watches are usually worn on a person's wrist. At one time, watches were commonly kept in the person's pocket.
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Atomic mass An atomic mass (symbol: m a) is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons. Atomic mass can be expressed in grams. However, because individual atoms have very small masses, this is not very helpful. Instead, atomic mass is expressed in unified atomic mass units (unit symbol: u). 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom.
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The second (s) However, the quartz and atomic clocks invented during the 1930s and 1950s are even better timekeepers, and show that the Earth does not rotate steadily but wobbles. Since 1967 the definition of the second has been related to the movement of electrons in a caesium atom: The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.
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Atomic clock The principle of operation of an atomic clock is based on atomic physics; it uses the microwave signal that electrons in atoms emit when they change energy levels. Early atomic clocks were based on masers at room temperature.
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Clock The Shepherd Gate Clock at the Royal Observatory, Greenwich. A clock is an instrument to indicate, keep, and co-ordinate time. The word clock is derived ultimately (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning bell. A silent instrument missing such a striking mechanism has traditionally been known as a timepiece.
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Doomsday Clock Cover of the 1947 Bulletin of the Atomic Scientists issue, featuring the Doomsday Clock at seven minutes to midnight. The Doomsday Clock's origin can be traced to the international group of researchers called the Chicago Atomic Scientists, who had participated in the Manhattan Project.
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Atomic orbital An atomic orbital is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus.rbitals are given names in the form: where X is the energy level corresponding to the principal quantum number n, type is a lower-case letter denoting the shape or subshell of the orbital and it corresponds to the angular quantum number ℓ, and y is the number of electrons in that orbital.
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- Not to be confused with locks, clocks are programs that count in seconds, minutes, and/or hours. Clocks are fairly easy to program, and have some utility uses. By making the clock have an alarm signal, you could make it run a veriety of different farms or mob grinders.
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How Alarm Clocks Work A digital alarm clock displays the time digitally using electronic components instead of using hands, springs, and gears. Instead of the oscillating wheel, the digital clock uses an electronic time-base that counts off the seconds, keeping time accurately. In place of the analog clock's gears, the digital clock uses a counter and an liquid crystal display (LCD) or a light-emitting diode (LED), which is a two-lead semiconductor (material that conducts electric current) light source. Digital clocks rely heavily on electronic parts such as capacitors and resistors, as these devices manage the flow of electrical current.
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Physicists Have Broken The Record For The Most Accurate Clock Ever Built It is regarded as certain that a future redefinition of the SI second will be based on an optical atomic clock, the team says. These have a considerably higher excitation frequency (1E14 to 1E15 Hz), which makes them much more stable and more accurate than caesium clocks.. Predicted back in the 1980s by Nobel Prize winning physicist, Hans G. Dehmelt, optical atomic clocks are basically laser traps for single ions or many neutral atoms.
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- doomsday clock n an image of a clockface representing the time remaining before the onset of a global catastrophe in terms of a number of minutes before midnight Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.
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clock clock 1. n. 1. An instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display. 2. A time clock. 3. A source of regularly occurring pulses used to measure the passage of time, as in a computer.
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Atomic Clocks Atomic clocks let you dispense with the hassle of setting a clock, as they self-set their time. This sleek black and white clock has a simple, modern look.
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Pendulum clock Pendulum clock. A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is a harmonic oscillator; it swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates. From its invention in 1656 by Christiaan Huygens until the 1930s, the pendulum clock was the world's most precise timekeeper, accounting for its widespread use. Throughout the 18th and 19th centuries pendulum
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- The is an alarm clock with an AM/FM radio receiver. It features a snooze button, lighted digital time display, built-in speaker, and sleep timer. The radio has analog tuning and covers kHz AM, as well as MHz FM.
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- pendulum clock - a clock regulated by a pendulum. 1  clock - a timepiece that shows the time of day. 2  grandfather clock, longcase clock - a pendulum clock enclosed in a tall narrow case.
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Clock Analog clocks usually indicate time using angles. The most common clock face uses a fixed numbered dial or dials and moving hand or hands. It usually has a circular scale of 12 hours, which can also serve as a scale of 60 minutes, and 60 seconds if the clock has a second hand.
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âIâm kind of flabbergastedâ: What itâs like to preside over the Doomsday Clock “The purpose of the Doomsday Clock is to provide a graphical way for people to suddenly think about these existential threats,” Prof Krauss said. “People tend to avoid thinking about these existential threats and don’t talk about them.”
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Atomic Age An early nuclear power plant that used atomic energy to generate electricity. The Atomic Age, also known as the Atomic Era, is the period of history following the detonation of the first nuclear (atomic) bomb, Trinity, on July 16, 1945 during World War II.tomic energy and weapons continue to have a strong effect on world politics in the 21st century. The term is used by some science fiction fans to describe not only the era following the conclusion of the Second World War but also contemporary history up to the present day.
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UTC â The World's Time Standard International Atomic Time (TAI) is a time scale that uses the combined output of some 400 highly precise atomic clocks. It provides the exact speed at which our clocks tick. Universal Time (UT1), also known as astronomical time, refers to the Earth's rotation. It is used to compare the pace provided by TAI with the actual length of a day on Earth.
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Modular arithmetic Modular arithmetic (sometimes called clock arithmetic) is a system of arithmetic for integers, where numbers wrap around after they reach a certain value—the modulus.ongruence relation. Modular arithmetic can be handled mathematically by introducing a congruence relation on the integers that is compatible with the operations of the ring of integers: addition, subtraction, and multiplication.
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Alarm clock An alarm clock is a clock that is designed to make a sound, or some other signal, at a specific time. The primary utility of these clocks is to awaken people from their night's sleep or short naps; they are sometimes used for other reminders as well. Most use sound; some use light or vibration.