# Recent content by Zahid Iftikhar

1. ### Time of Impact of Gas Molecules on the Inner Wall of a Pressure Vessel

In derivation of relation for pressure of Gas ,(see pic below) the time for rate of change of momentum of molecules should be the time for which the wall of the vessel and the molecules kept interacting with each other, not the time between successive collisions. As circumscribed below, my...
2. ### I Stability of Nuclei

Thank you Dr_Nate for the kind reply. All I am understanding from your replies is there is some special mechanism by which a nucleus absorb energies. I humbly submit I lack that knowledge and request to kindly share something about it. Is this absorption similar to an electron inside an orbit...
3. ### I Stability of Nuclei

I am thankful that the replies have helped me clarify many of my misconceptions. I have one more doubt in mind in support of my statement made earlier regarding breaking of nucleus. In Rutherford nuclear reaction where nitrogen is hit by alpha particles and oxygen and a proton are produced...
4. ### I Stability of Nuclei

Thanks Sir. It is very convincing argument. I am pleased and thankful for your time. High regards.
5. ### I Stability of Nuclei

Thanks for the reply. I correct myself. Sure sunlight falls short of binding energy of nucleus. But my question still stands. The thermal energy we provide during chemical reactions aren't sufficient enough to provide this required energy? Please reply with a little bit detail. Regards
6. ### I Stability of Nuclei

Hi I need help from PF scholars to figure out one difficulty in understanding stability of nucleus. Nuclei remain unaffected during chemical reactions taking place even at very high temperatures and pressures. But their binding energy figures are not that high. Such chemical reactions have heat...
7. ### Voltage across R, L and C vs AC Voltage source in RLC Series Circuit

Thanks. I need more help on this please.
8. ### Voltage across R, L and C vs AC Voltage source in RLC Series Circuit

One property of series resonance circuit is that at resonance, the voltage across circuit elements R,L and C may be larger than the source voltage. I can relate it to vector analogy where component vectors may have larger values than the resultant and the phenomenon is counter-intuitive. This...
9. ### Why does a capacitor charge to 63% of the applied voltage?

Thanks indeed. This is the best part of the discussion. I am way satisfied. Thanks to everybody who helped. You all are great people.
10. ### Why does a capacitor charge to 63% of the applied voltage?

Thanks indeed for the detailed explanation. I am sure I have lacked in exactly communicating my question and I added a clipping to support me to clarify. I understand in all you wrote above. I understand a capacitor keeps charging for infinite time and in every time constant there is an...
11. ### Why does a capacitor charge to 63% of the applied voltage?

It is very kind of you Sir to come for help. I am sure you will encourage to ask rather silly questions. I am sure these will bridge some knowledge gaps. Regards.
12. ### Why does a capacitor charge to 63% of the applied voltage?

Thanks Sir. You said that it was more of a definition. To my understanding definitions are man-made meant to simplify the things and once decided may be helpful to understand laws and principles.(I may be wrong). I have studied in this thread that it is not a Physics law or Principle (time...
13. ### Why does a capacitor charge to 63% of the applied voltage?

That is a brilliant analogy Sir, very helpful to understand capacitor working. I use another while teaching to my classes. Two identical water tanks connected thru a valve, one tank remains full and is filled automatically if its level changes (Battery) and the other is empty (Capacitor). The...
14. ### Why does a capacitor charge to 63% of the applied voltage?

I am thankful to all the worthy scholars who commented on my question. I become over-enjoyed when people from PF give value to a question, spare their valuable time and add very useful explanations. I can count there are many questions, which I tried hard to find answers with my own effort but...
15. ### Why does a capacitor charge to 63% of the applied voltage?

I am absolutely thankful for your time to address my query. What I meant from my question was how a capacitor knows it should charge to 63% of the equilibrium charge, not 70% or 80% or any other value. Please see the clipping I have attached if my question is still not clear. High regards. Zahid