How accurate is an atomic clock? Detailed answer

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How accurate is an atomic clock? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

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How accurate is an atomic clock?

An atomic (quantum) clock is a time measuring device containing a crystal oscillator controlled by a quantum frequency standard.

The role of the "pendulum" in the atomic clock is played by atoms. The frequency of radiation of atoms during their transition from one energy level to another regulates the course of atomic clocks. This frequency is so stable that atomic clocks can measure time more accurately than astronomical methods.

In 2005, an atomic clock was made in Japan, which, if it had been switched on at the moment of the birth of the Universe, by now would not have “gone” even for one second.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What is the value of an orange dollar bill?

Now the largest of the US dollar denominations issued is 100 dollars. And from 1929 to 1945, notes were issued in denominations from $500 to $10, and even an orange $000 note specifically for payments between government agencies. They were no longer printed due to the development of the electronic payment system and to counter organized crime. Today, such bills are still in small numbers and may well serve as a means of payment in a regular store, although collectors will buy them for a much higher price.

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California bans plastic straws 26.09.2018

California Gov. Jerry Brown has signed a bill that will allow restaurants to dispense plastic straws for soft drinks only at the request of a visitor - by default, soda will now have to be drunk directly from a glass.

California has become the first US state to introduce legal restrictions on the use of single-use straws as part of the fight against plastic pollution in the oceans. At the same time, in some cities on the west coast - for example, San Francisco and Seattle - straws for drinks are already prohibited. Similar bills are already being considered in New York and Washington, and coffee chain Starbucks and several airlines are battling straws privately.

The problem of water pollution with plastic is by no means a joke - most of the garbage ends up in water bodies, where it poses a serious danger to animals and birds. Moreover, microscopic particles and fibers of plastic, as American scientists have found out, are contained even in tap water around the world: most of them were found in water from the USA and Lebanon (94% of water samples contained plastic), as well as India (92%). The least plastic in water comes from Europe - it contained 72% of the samples.

California's straw ban will go into effect on January 1 next year and will only affect restaurants with waiters, not fast food establishments. After two warnings, the establishment will have to pay a $300 fine. Also, as part of the fight against obesity, Brown signed a law that requires that since the new year, the drink in children's meals in fast food establishments should be water or milk by default, but not sugary sodas and juices - they will also have to be requested separately.

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