CBSE Class 12-science Answered

sir, i had asked some q's today but i have not got ur reply. nyways, i have to ask some more q's to u

Explain how the average velocity of free electrons in a metal at constant temperature in an electric field remains constant even though the electrons are being constantly accelerated by this electric field ?What is the basic difference between the atom or molecule of a diamagnetic and a paramagnetic material ? Why are elements with even atomic number more likely to be diamagnetic ?Prove that the instantaneous rate of change of the activity of a radioactive substance is inversely proportional to the square of its half life.

Dear Student

Please restrict to one question per query. Better if teh questions are more conceptual rather than memeory based or numericals.

- average velocity of free electrons in a metal at constant temperature in an electric field remains constant ...during the very short time inetrval = relaxation time= whihc is time inetrval between two successive collisions. This is an assumption that in between two successive collisons the avaergae velocity remians constant.

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