This video about Time keeping history and Second definition explanation in Bangla.
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Chapters:
00:00 - Intro
01:09 - Time keeping history
05:18 - Pendulum clock
08:55 - Quartz crystal oscillator clock
09:59 - Time unit second definition
11:51 - Atomic clock
#BigganPiC #history #second #Education #atomic_clock #Physics #science
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