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📖 Get to know our publishing house: https://radionaukowe.pl/wydawnictwo 📚 Convenient book shopping: https://wydawnictwoRN.pl. Use the discount code for audiobooks: sluchamRN 👉 Become a Patron: https://patronite.pl/radionaukowe 👉 Make a one-time support: https://suppi.pl/radionaukowe 🎧 Listen on streaming: https://ffm.bio/radionaukowe 🔔 Subscribe: / @radionaukowe 🌐 Website: https://radionaukowe.pl 👍 Facebook: / radionaukowe 📷 Instagram: / radionaukowe ❌ Twitter: / radionaukowe 🎓 Visit LAMU: / @letniaakademiamlodychumyslow 🎬 See more: • Radio Naukowe recommends 📩 Contact: [email protected] Śródmieście, Warsaw. The building on Elektoralna Street contains four cesium-based atomic clocks and two hydrogen masers. These are also atomic clocks, but they use hydrogen and stable microwave beams. Thanks to these devices, we know in Poland what time to get up for work, how late the train was and when to turn on USOS to register for classes, and Krzysztof Ibisz counts down the seconds to the New Year every year without fail. I talk about time measurement with specialists from the Central Office of Measures: Dr. Albin Czubla and Dr. Eng. Maciej Gruszczyński. "Time is the most precisely measured physical quantity," notes Dr. Czubla. In the past, it was determined based on astronomical observations, but such measurements are influenced by many variables. Meanwhile, accurate and synchronized time measurement around the world is extremely important today. Imagine time measured unevenly, e.g. at stock exchanges or in air traffic! Therefore, the definition of a second must be as precise as possible. "We had to find something that is very stable in terms of frequency, some physical phenomenon," explains Dr. Eng. Gruszczyński. The current definition of a second is based on the hyperfine transition frequency in cesium-133 atoms… and is not final at all. Work is underway on new types of atomic clocks, which will certainly translate into a new definition. The clocks are synchronized at an international level. Data from atomic clocks in the measurement offices of individual countries are sent to the International Bureau of Weights and Measures, which calculates a weighted average and determines the appropriate corrections for different countries. The Central Office of Measures in Warsaw provides us with accurate time in several ways. It has its own servers with NTP encryption (they accept several hundred thousand queries per second), dedicated fiber-optic connections for key clients (these are, for example, mobile networks), and in addition, it broadcasts an acoustic signal every hour on Polish Radio. We also talk about the fact that this issue with the change of time is not so clear-cut, that there are important reasons to abandon the leap second, how much a hydrogen maser costs (does anyone have an unnecessary 2 million złoty?) and why time information on the London Stock Exchange is pulled along a cable, i.e. transmitted via fiber-optics. Check the time! https://e-czas.gum.gov.pl/ WE RECOMMEND OTHER MATERIALS: • Science Radio - All episodes • Physics • Biology • Astronomy • Psychology • Animals • Religion • History • History of life • Geography • Technology • Human • Culture • Medicine • Archaeology 00:00 - 01:20 Introduction 01:20 - 9:28 What is a second and how long is a meter? 9:28 - 16:00 How does an atomic clock work? System of units of measurement 16:00 - 26:25 Time dilation and reference systems 26:25 - 36:25 How much does an atomic clock cost? Hydrogen maser 36:25 - 50:08 Where do we use time measurement by atomic clocks in everyday life? 50:08 - 58:30 The e-CzasPL application and leap seconds 58:30 - 1:10:55 Are leap years and time changes a good idea? 1:10:55 - 1:21:52 The future of timekeeping 🧠 Radio Naukowe - turn on the knowledge! 🧠 #RadioNaukowe #KarolinaGłowacka #AlbinCzubla #MaciejGruszyński