كل يوم سؤال When entropy = 0, does atomic motion stop

abebas123 · #1 2008-05-07, 11:58 PM

Question
It is know that entropy is zero when a pure crystalline substance is at absolute zero. Theoretically, does this mean that atomic motion (electrons, etc.) stops also

Answer
Zero entropy means that the system is in a single quantum mechanical state, in particular, the lowest, the ground state. This means that the particles of the system have adjusted their motions to lower their energy as much as possible. However, because of quantum mechanical effects there is still residual motion of the particles. This is measurable and detectable and is often called zero point motion. It is particularly observable in the motion of the atoms when they are studied by x-rays. Even in the lowest energy state of a metal, the electrons are still moving around
keeping the energy as low as possible

See you tomorrow

waleed_hamoda · #2 2008-05-08, 02:13 PM

Thanks brother
here u r also this
http://www.newton.dep.anl.gov/archive.htm

خيارات الموضوع
عرض نسخة للطّباعة ارسل هذه الصفحة لصديق
طريقة العرض
النمط المتتابع التحول إلى النمط التشعبي التحول إلى النمط الأُحادي

مواضيع مشابهة للموضوع: كل يوم سؤال When entropy = 0, does atomic motion stop
الموضوع	الكاتب	القسم	الردود	آخر مشاركة
Stop Faking It! Chemistry Basics	deepa08	الهندسة العامة	1	2008-09-21 05:03 PM
Atomic Physics (Oxford Master Series in Atomic, Optical and Laser Physics)	dedoda	الفيزياء الرياضية	3	2008-08-03 11:34 PM
Entropy information theory	dedoda	الفيزياء العامة	2	2008-05-19 04:50 AM
Entropy and Energy: A Universal Competition	inmyheart	الكيمياء الفيزيائية	1	2008-04-20 03:44 PM
The Easy Way to Stop Smoking	صيدلانية سعودية	النقاشات الطبية	2	2007-08-11 09:54 PM

عدد 2 من الطلاب تقدموا بالشكر لكاتب الموضوع abebas123 علي هذه المشاركة الطيبة :
inmyheart (2008-05-08), ابن العراق (2008-05-08)

يتصفح الموضوع حالياً : 1 (0 عضو و 1 ضيف)