Atomic Clock
Atomic clock idea was first given in 1879 by Lord Kelvin. The practical method was done on in 1930 by Isidor Rabi. Then in 1949 in US National Bureau of Standards that’s now called NIST invented first atomic clock. The first atomic clock was of ammonia maser. Its world’s most accurate clock. It works could be to tell the accurate time with no ambiguity. Atomic clock tells time better than another clock in the world. Even it could keep the time better than the rotation in the Earth and even greater than the movement of stars in galaxy. This clock works on atom and electrons surrounding it. It calculates the mass in the nucleus and the electrons charge surrounding it.
Different type of atomic clocks are available. The primary functions of all the atomic clocks are same. A basic difference is just the material used in it in different. The elements used inside atomic clock are detecting the energy level for time calculation in different ways. There are three types of atomic clocks are available:
- Cesium atomic clocks: A clock which measures energy level by magnetic field
- Hydrogen atomic clocks: A clock that measures time by hydrogen atoms.
- Rubidium atomic clocks: It is the simplest form of atomic clock which cans measures the time through microwave frequency in its around absorbing the light in optical.
Atomic clock is not harmful and do not release any kind of radioactive rays. The early atomic clocks were based on masers. In this new era the atomic clock consists of absorption spectroscopy which absorbs the cold atoms in atomic fountains.
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