ماذا تعرف عن الثانية ؟

الكاتب: أ. عبد الله محمود عبد اللهتاريخ النشر: يوليو 28, 2016 وقت القراءة:

للقراءة

ماذا تعرف عن الثانية ؟

هي وحدة قياس الزمن في جملة الواحدات الدولية (SI)، وهي تعادل 9192631770 دورة من الإشعاع الذي يصدرهُ انتقال الإلكترون بين مستويين معينين للطاقة في ذرة السيزيوم133، وتم الاتفاق على تعريفها عام 1967، ويُُرمز لها اختصاراً برمز (ثا) أو (s) أو (sec).

المصدر:
whatis.techtarget.com

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